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Jan 22, 2007, 9:36:18 AM1/22/07

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Adherents of LET often make statements such as "Lorentz ether theory

does not know any paradoxes of relative motion" [1]. Even some of

those who adhere to Special Relativity use LET in order to defend

SR from paradoxes. They argue that LET, based only on time dilation

and length contraction, makes the same predictions as SRT without the

seemingly paradox SR simultaneity concept.

does not know any paradoxes of relative motion" [1]. Even some of

those who adhere to Special Relativity use LET in order to defend

SR from paradoxes. They argue that LET, based only on time dilation

and length contraction, makes the same predictions as SRT without the

seemingly paradox SR simultaneity concept.

The perported equivalence between SR and LET however stems from an

astonishingly huge error, exemplified in this text [2]:

"... two mirrors in parallel motion, with a pulse of light bouncing

between them. In this case the motion of the mirrors actually does

diminish the frequency of bounces, relative to the stationary ether

frame, because the light must travel further between each reflection.

Thus the time intervals 'expand' (i.e., dilate). Given this time

dilation of the local moving coordinates, it's fairly obvious

that there must be a corresponding change in the effective space

coordinate (since spatial lengths are directly related to time

intervals by dx = v*dt). In other words, if an observer moves at

speed v relative to the ground, and passes over an object of length

L at rest on the ground, the length of the object as assessed by the

moving observer is affected by his measure of time. Since he is

moving at speed v, the length of the object is v*dt, where dt is the

time it takes him to traverse the length of the object – but which

"dt" will he use? Naturally if he bases his length estimate on the

measure of the time interval recorded on a ground clock, he will

have dt = L/v, so he will judge the object to be v*(L/v) = L

units in length. However, if he uses his own effective time as

indicated on his own co-moving transverse light clock, he will

have dt' = dt * (1 - v^2)^1/2, so the effective length is

v * [(L/v) * (1 - v2)^1/2] = L * (1 - v^2)^1/2. Thus, effective

length contraction (and no transverse expansion) is logically

unavoidable given the effective time dilation."

Generally accepted premisses of LET are:

- the ether is rigid

- moving time dt' dilates/expands with respect to ether time dt:

dt = dt' * gamma

- moving length dx' in direction of motion contracts wrt the ether:

dx = dx' / gamma

However, the basic reasoning exemplified in the above quoted text

implies instead of contraction of moving objects the exact contrary:

contraction of the rigid ether with respect to moving objects. In

LET (inasfar as it is not "a clever restatement" of SR), contraction

results from the motion through the ether [3], so contraction of the

ether with respect to moving objects is impossible.

References:

[1] The Twin Paradox in Special Relativity and in Lorentz Ether Theory,

http://redshift.vif.com/JournalFiles/V10NO3PDF/V10N3KHO.pdf

[2] Reflections on Relativity, 1.5 Corresponding States,

http://www.mathpages.com/rr/s1-05/1-05.htm

[3] "... assuming that the electron, deformable and compressible, is

subject to a kind of exterior constant pressure whose effect ..."

Poincaré, June 1905, see:

http://groups.google.com/group/sci.physics/msg/4e5049b2c4a76432

Jan 22, 2007, 10:12:13 AM1/22/07

to

> However, the basic reasoning exemplified in the above quoted text

> implies instead of contraction of moving objects the exact contrary:

> contraction of the rigid ether with respect to moving objects. In

> LET (inasfar as it is not "a clever restatement" of SR), contraction

> results from the motion through the ether [3], so contraction of the

> ether with respect to moving objects is impossible.

> implies instead of contraction of moving objects the exact contrary:

> contraction of the rigid ether with respect to moving objects. In

> LET (inasfar as it is not "a clever restatement" of SR), contraction

> results from the motion through the ether [3], so contraction of the

> ether with respect to moving objects is impossible.

Correct. Your quoted example is wrong. It should be the other way.

>Since he is moving at speed v, the length of the object is v*dt, where

>dt is the time it takes him to traverse the length of the object - but

>which "dt" will he use? Naturally if he bases his length estimate on

> the measure of the time interval recorded on a ground clock, he will

>have dt = L/v, so he will judge the object to be v*(L/v) = L

That is totally wrong as you noted. The author of that claim has either

screwed up or

is.... <cough, cough>.

LET and SR perdict that a measurement of the lenght of the object will

be v*dt where dt is the measured time (clock) and v the measured speed.

The v*dt will yield L/gamma in both theories.

Message has been deleted

Jan 22, 2007, 11:51:03 AM1/22/07

to

<rot...@gmail.com> wrote in message news:1169478732.9...@q2g2000cwa.googlegroups.com...

Who cares?, they are both ridiculous.

http://www.androcles01.pwp.blueyonder.co.uk/mmx4dummies.htm

Jan 23, 2007, 3:22:59 AM1/23/07

to

"Wolfgang G. Gasser" <z...@z.lol.li> wrote in message

news:ep2hvi$qli$1...@atlas.ip-plus.net...

> Adherents of LET often make statements such as "Lorentz ether theory

> does not know any paradoxes of relative motion" [1]. Even some of

> those who adhere to Special Relativity use LET in order to defend

> SR from paradoxes. They argue that LET, based only on time dilation

> and length contraction, makes the same predictions as SRT without the

> seemingly paradox SR simultaneity concept.

Your summary is a bit incomplete: it omits increase of inertia with speed as

well as the fact that conventionality of simultaneity is necessary in any

interpretation. BTW, what you call "LET" is simply the earliest

interpretation of SRT, and thus it's a bit historical.

> The perported equivalence between SR and LET however stems from an

> astonishingly huge error, exemplified in this text [2]:

>

> "... two mirrors in parallel motion, with a pulse of light bouncing

> between them. In this case the motion of the mirrors actually does

> diminish the frequency of bounces, relative to the stationary ether

> frame, because the light must travel further between each reflection.

> Thus the time intervals 'expand' (i.e., dilate). Given this time

> dilation of the local moving coordinates, it's fairly obvious

> that there must be a corresponding change in the effective space

> coordinate (since spatial lengths are directly related to time

> intervals by dx = v*dt). In other words, if an observer moves at

> speed v relative to the ground, and passes over an object of length

> L at rest on the ground, the length of the object as assessed by the

> moving observer is affected by his measure of time. Since he is

> moving at speed v, the length of the object is v*dt, where dt is the

> time it takes him to traverse the length of the object - but which

> "dt" will he use? Naturally if he bases his length estimate on the

> measure of the time interval recorded on a ground clock, he will

> have dt = L/v, so he will judge the object to be v*(L/v) = L

> units in length. However, if he uses his own effective time as

> indicated on his own co-moving transverse light clock, he will

> have dt' = dt * (1 - v^2)^1/2, so the effective length is

> v * [(L/v) * (1 - v2)^1/2] = L * (1 - v^2)^1/2. Thus, effective

> length contraction (and no transverse expansion) is logically

> unavoidable given the effective time dilation."

What problem do you have with that? I think that the author of mathpages is

(as usual) correct on the math. The earth's atmosphere appears contracted to

a muon (if a muon had brains). Where do you claim that he made a mistake?

> Generally accepted premisses of LET are:

>

> - the ether is rigid

> - moving time dt' dilates/expands with respect to ether time dt:

> dt = dt' * gamma

Yes, as measured in a "stationary" system:

dt' = dt/gamma (a moving clock appears to slow down; thus a really moving

clock really slows down)

> - moving length dx' in direction of motion contracts wrt the ether:

> dx = dx' / gamma

No, not in a "stationary" system:

dx' = dx/gamma (a moving rod appears to contract; thus a really moving

rod really contracts)

> However, the basic reasoning exemplified in the above quoted text

> implies instead of contraction of moving objects the exact contrary:

> contraction of the rigid ether with respect to moving objects.

No, in SRT -no matter what your interpretation- the observations are

reciprocal. That's mentioned in your ref. 2 as well as in your ref. 3

("These transformations, ..., must form a group").

> In

> LET (inasfar as it is not "a clever restatement" of SR)

You have it upside down...

> , contraction

> results from the motion through the ether [3], so contraction of the

> ether with respect to moving objects is impossible.

The "astonishingly huge error", as you call it, is all yours.

Cheers,

Harald

Jan 23, 2007, 8:26:10 PM1/23/07

to

:: = Wolfgang G. Gasser in news:ep2hvi$qli$1...@atlas.ip-plus.net

: = harry in news:1169540...@sicinfo3.epfl.ch

: = harry in news:1169540...@sicinfo3.epfl.ch

:: "... However, if he uses his own effective time as

:: indicated on his own co-moving transverse light clock, he will

:: have dt' = dt * (1 - v^2)^1/2, so the effective length is

:: v * [(L/v) * (1 - v2)^1/2] = L * (1 - v^2)^1/2. Thus, effective

:: length contraction (and no transverse expansion) is logically

:: unavoidable given the effective time dilation."

:

: What problem do you have with that? I think that the author of

: mathpages is (as usual) correct on the math.

The author is discussing as possible explanations of the Michelson-

Morley experiment: "transverse expansion" versus "longitudinal

contraction" of "the material comprising Michelson's apparatus".

In order to decide this question, he makes a (consistent) reasoning

(starting from time dilation) leading to the conclusion that the

ether contracts wrt a moving object. Using this contraction of the

ether, he decides the open question in favour of "longitudinal

contraction" of Michelson's apparatus (and against "transverse

expansion").

However, the author does not notice, that contraction of the ether

wrt to the apparatus is the EXACT OPPOSITE of contraction of the

apparatus wrt the ether. The only way to get a contraction of the

ether wrt to moving objects is an expansion of the moving objects

(and their rulers) wrt the ether. See [1]. But e.g. Tom Roberts

claims (or at least claimed in January 2000) that "there is never

any sort of 'Lorentz expansion'" [2].

: The earth's atmosphere appears contracted to a muon

and the muon appears contracted to the earth's atmosphere.

However, inasfar as the atmosphere appears contracted to the muon,

the muon itself is expanded wrt the atmosphere, and inasfar the

atmosphere appears contracted, the muon is expanded.

This reciprocal contraction/expansion in SR is only possible

if we adopt Einstein's simulaneity concept, where v/c^2*x of

the time transformation is as 'real' as v*t of the x-coordinate

transformation:

x' = gamma * (x - v*t)

t' = gamma * (t - v/c^2*x)

The claim that v/c^2*x is only a convention has no more

justification than the claim that v*t is only a convention.

:: Generally accepted premisses of LET are:

::

:: - the ether is rigid

:: - moving time dt' dilates/expands with respect to ether time dt:

:: dt = dt' * gamma

:

: Yes, as measured in a "stationary" system:

:

: dt' = dt/gamma (a moving clock appears to slow down; thus a really

: moving clock really slows down)

Correct. Slowing down corresponds to EXPANSION of time intervals.

:: - moving length dx' in direction of motion contracts wrt the ether:

:: dx = dx' / gamma

:

: No, not in a "stationary" system:

:

: dx' = dx/gamma (a moving rod appears to contract; thus a really

: moving rod really contracts)

Here also you are a victim of the confusion (resp. fatal error) I'm

dealing with. According to SR, dx' = dx/gamma means contraction

of rest-frame distances wrt the moving-frame. An ether distance of

e.g. dx = 1 light-year is contracted to dx' = l LY / gamma in the

moving-frame.

However, you correctly have deduced your wrong interpretation of

dx' = dx/gamma from premisses which are assumed to be valid:

(1) In LET there is neither expansion of moving objects nor

contraction of the ether.

(2) dt' = dt/gamma

(3) dx'/dt' = v = dx/dt

From (2) and (3) you conclude dx' = dx/gamma and according to (1)

contraction of the moving object is the only valid interpretation.

So your point of view no more justifiable than the one of 'rotchm' [3]

who came to the opposite conclusion:

"Your quoted example is wrong. It should be the other way."

"The author ... has either screwed up or ..."

The existence of contradicting conclusions in a theoretical system is

a clear indication of inconsistence.

:: However, the basic reasoning exemplified in the above quoted text

:: implies instead of contraction of moving objects the exact contrary:

:: contraction of the rigid ether with respect to moving objects.

:

: No, in SRT - no matter what your interpretation - the observations are

: reciprocal. That's mentioned in your ref. 2 as well as in your ref. 3

: ("These transformations, ..., must form a group").

Do you mean by "the observations are reciprocal" that rest-frame

distances contract in the same way wrt a moving-frame as the

corresponding moving-frame distances wrt to the rest-frame? If yes,

do you suggest that this kind of reciprocity somehow follows from

the group-property of the Lorentz transformation? If yes, how?

Cheers, Wolfgang

[1] Simulation of Special Relativity by LET:

http://groups.google.com/group/sci.physics.relativity/msg/9d447bb45109a585

[2] http://groups.google.com/group/sci.math/msg/171c14a33690331b

[3] news:1169478732.9...@q2g2000cwa.googlegroups.com

Jan 24, 2007, 4:29:56 AM1/24/07

to

news:ep6cfd$3uk$1...@atlas.ip-plus.net...

> :: = Wolfgang G. Gasser in news:ep2hvi$qli$1...@atlas.ip-plus.net

> : = harry in news:1169540...@sicinfo3.epfl.ch

>

> :: "... However, if he uses his own effective time as

> :: indicated on his own co-moving transverse light clock, he will

> :: have dt' = dt * (1 - v^2)^1/2, so the effective length is

> :: v * [(L/v) * (1 - v2)^1/2] = L * (1 - v^2)^1/2. Thus, effective

> :: length contraction (and no transverse expansion) is logically

> :: unavoidable given the effective time dilation."

> :

> : What problem do you have with that? I think that the author of

> : mathpages is (as usual) correct on the math.

>

> The author is discussing as possible explanations of the Michelson-

> Morley experiment: "transverse expansion" versus "longitudinal

> contraction" of "the material comprising Michelson's apparatus".

>

> In order to decide this question, he makes a (consistent) reasoning

> (starting from time dilation) leading to the conclusion that the

> ether contracts wrt a moving object. Using this contraction of the

> ether, he decides the open question in favour of "longitudinal

> contraction" of Michelson's apparatus (and against "transverse

> expansion").

> :: = Wolfgang G. Gasser in news:ep2hvi$qli$1...@atlas.ip-plus.net

> : = harry in news:1169540...@sicinfo3.epfl.ch

>

> :: "... However, if he uses his own effective time as

> :: indicated on his own co-moving transverse light clock, he will

> :: have dt' = dt * (1 - v^2)^1/2, so the effective length is

> :: v * [(L/v) * (1 - v2)^1/2] = L * (1 - v^2)^1/2. Thus, effective

> :: length contraction (and no transverse expansion) is logically

> :: unavoidable given the effective time dilation."

> :

> : What problem do you have with that? I think that the author of

> : mathpages is (as usual) correct on the math.

>

> The author is discussing as possible explanations of the Michelson-

> Morley experiment: "transverse expansion" versus "longitudinal

> contraction" of "the material comprising Michelson's apparatus".

>

> In order to decide this question, he makes a (consistent) reasoning

> (starting from time dilation) leading to the conclusion that the

> ether contracts wrt a moving object. Using this contraction of the

> ether, he decides the open question in favour of "longitudinal

> contraction" of Michelson's apparatus (and against "transverse

> expansion").

I did not interpret his writing that way - instead I interpreted it as I

indicated in my next sentence.

For sure an "ether contraction" interpretation would not work and you would

be right to go against it.

> However, the author does not notice, that contraction of the ether

> wrt to the apparatus is the EXACT OPPOSITE of contraction of the

> apparatus wrt the ether. The only way to get a contraction of the

> ether wrt to moving objects is an expansion of the moving objects

> (and their rulers) wrt the ether. See [1]. But e.g. Tom Roberts

> claims (or at least claimed in January 2000) that "there is never

> any sort of 'Lorentz expansion'" [2].

See above.

> : The earth's atmosphere appears contracted to a muon

>

> and the muon appears contracted to the earth's atmosphere.

Exactly.

> However, inasfar as the atmosphere appears contracted to the muon,

> the muon itself is expanded wrt the atmosphere,

Uncontracted you should mean; and only in the rest-frame of the muon...

> and inasfar the

> atmosphere appears contracted, the muon is expanded.

Not so: moving objects appear to *contract* in SRT, while proper lengths are

unaffected.

> This reciprocal contraction/expansion in SR

See above: you must be confused...

> is only possible

> if we adopt Einstein's simulaneity concept, where v/c^2*x of

> the time transformation is as 'real' as v*t of the x-coordinate

> transformation:

>

> x' = gamma * (x - v*t)

> t' = gamma * (t - v/c^2*x)

>

> The claim that v/c^2*x is only a convention has no more

> justification than the claim that v*t is only a convention.

The convention is to declare the frame of choice to be "in rest".

> :: Generally accepted premisses of LET are:

> ::

> :: - the ether is rigid

> :: - moving time dt' dilates/expands with respect to ether time dt:

> :: dt = dt' * gamma

> :

> : Yes, as measured in a "stationary" system:

> :

> : dt' = dt/gamma (a moving clock appears to slow down; thus a really

> : moving clock really slows down)

>

> Correct. Slowing down corresponds to EXPANSION of time intervals.

>

> :: - moving length dx' in direction of motion contracts wrt the ether:

> :: dx = dx' / gamma

> :

> : No, not in a "stationary" system:

> :

> : dx' = dx/gamma (a moving rod appears to contract; thus a really

> : moving rod really contracts)

>

> Here also you are a victim of the confusion (resp. fatal error) I'm

> dealing with. According to SR, dx' = dx/gamma means contraction

> of rest-frame distances wrt the moving-frame.

dx = dx'/gamma is valid in S' only. It's an often.made mistake of

contributors to this group to mix reference frames, which implies making

transformation errors. One should not mix values of miles and and km in one

calculation.

> An ether distance of

> e.g. dx = 1 light-year is contracted to dx' = l LY / gamma in the

> moving-frame.

"ether" and "is contracted" are incompatible, just as "proper" and

"contracted" are incompatible. You could say: a rest frame distance of e.g.

dx = 1 light-year appears to be contracted to dx' = l LY / gamma in the

moving-frame.

> However, you correctly have deduced your wrong interpretation of

> dx' = dx/gamma from premisses which are assumed to be valid:

>

> (1) In LET there is neither expansion of moving objects nor

> contraction of the ether.

> (2) dt' = dt/gamma

(2) is only valid in S.

In S': dt' = dt*gamma. Just check the textbooks -they also explain why

(hint: simultaneity).

> (3) dx'/dt' = v = dx/dt

> From (2) and (3) you conclude dx' = dx/gamma

Only in S.

> and according to (1)

> contraction of the moving object is the only valid interpretation.

Indeed: "the moving object" means dx' as determined in S.

> So your point of view no more justifiable than the one of 'rotchm' [3]

> who came to the opposite conclusion:

>

> "Your quoted example is wrong. It should be the other way."

> "The author ... has either screwed up or ..."

I think that both of you misunderstand what the author of mathpages wrote.

> The existence of contradicting conclusions in a theoretical system is

> a clear indication of inconsistence.

>

> :: However, the basic reasoning exemplified in the above quoted text

> :: implies instead of contraction of moving objects the exact contrary:

> :: contraction of the rigid ether with respect to moving objects.

> :

> : No, in SRT - no matter what your interpretation - the observations are

> : reciprocal. That's mentioned in your ref. 2 as well as in your ref. 3

> : ("These transformations, ..., must form a group").

>

> Do you mean by "the observations are reciprocal" that rest-frame

> distances contract in the same way wrt a moving-frame as the

> corresponding moving-frame distances wrt to the rest-frame?

Do you mean by "distances contract", not the objects themselves but the

measures thereof? Then indeed, that's well known to be the case.

> If yes,

> do you suggest that this kind of reciprocity somehow follows from

> the group-property of the Lorentz transformation? If yes, how?

Sure - it means that the inverse transform (with v' = -v) has the same form,

so that observers in both frames measure the same effects.

Most textbooks give the derivation. For those who don't trust that or want

to see how that works in practice, I also gave an example with numbers:

See also the long recent thread where people tried to explain that to Ken

Seto ("Question on the LT and the inverse LT").

Cheers,

Harald

Jan 24, 2007, 3:37:05 PM1/24/07

to

:: = Wolfgang G. Gasser in news:ep6cfd$3uk$1...@atlas.ip-plus.net :

: = harry in news:1169630...@sicinfo3.epfl.ch :

: = harry in news:1169630...@sicinfo3.epfl.ch :

Harry:

::: dx' = dx/gamma (a moving rod appears to contract; thus a really

::: moving rod really contracts)

Wolfgang:

:: Here also you are a victim of the confusion (resp. fatal error) I'm

:: dealing with. According to SR, dx' = dx/gamma means contraction

:: of rest-frame distances wrt the moving frame.

Harry:

: dx = dx'/gamma is valid in S' only. It's an often made mistake ...

Should this be a con trick in order to obfuscate your error above,

or are you simply confusing dx with dx'?

Your just introduced version dx = dx'/gamma actually has the meaning

you by mistake first attributed to dx' = dx/gamma: a moving rod

contracts wrt to the rest frame.

This new version dx = dx'/gamma is valid if we assume simultaneity

in the rest frame S, i.e. dt = 0:

dx' = gamma * (dx - v*dt) --> dx' = dx * gamma

--> dx = dx' / gamma

However, the version we originally have been dealing with,

dx' = dx/gamma, implies simultaneity in S', i.e. dt' = 0:

dx = gamma * (dx' + v*dt') --> dx = dx' * gamma

--> dx' = dx / gamma

So S-simultaneity leads to contraction of S' wrt S (or expansion of S

wrt S') and S'-simultaneity to contraction of S wrt S' (or expansion

of S' wrt S).

:: An ether distance of e.g. dx = 1 light-year is contracted to

:: dx' = l LY / gamma in the moving-frame.

:

: "ether" and "is contracted" are incompatible,

and Lorentz ether theory is therefore inconsistent.

Let us assume a twin-paradox situation where one twin remains at rest

in the ether whereas the other travels with v = 0.5 c to a point 1 LY

away from the twin at rest. So an ether distance dx = l LY is passed

in dt = 2 years.

From time dilation follows that the moving twin does not need 2 years

proper time to reach the destination but only dt' = 2 Yr / gamma. So,

if the ether-distance dx from the twin at rest to the destination is

identical wrt the moving twin (i.e. dx' = dx = 1 LY) we get wrt the

moving twin a proper speed of:

v' = dx' / dt' = dx / (dt/gamma) = v * gamma.

The only way to get a moving-twin speed of v' = v is the assumption,

that the ether distance dx = 1 LY contracts by gamma wrt the moving

twin:

dx' = dx/gamma --> dx'/dt' = (dx/gamma) / (dt/gamma) = v

Time dilation is time expansion. If we combine time dilation with

length contraction, then velocity as length divided by time obviously

cannot remain invariant. Therefore we must combine time dilation of

a moving object with with length expansion of the object (equivalent

to contraction of the rest frame).

: I think that [] you misunderstand what the author of mathpages wrote.

Try again: news:ep2hvi$qli$1...@atlas.ip-plus.net

Interestingly the LET-SR confusion, we are dealing with, shows up as

a different incarnation in the article you've pointed to. There you

write:

"Similarly, the clocks will tick at 3/5 of the rate in rest, making

one tick 0.6 s of duration. Because this is determined relative to

the stationary ether or absolute space, the effects correspond to

physical reality."

http://groups.google.com/group/sci.physics.relativity/msg/9db6b5df54b79f1d

If the clock rate of a moving clock is 3/5 of the rate of rest-frame

clocks, then one moving-clock cycle does not result in 0.6 sec in the

rest frame, but in 5/3 sec. Imagine simply a transversal light clock

moving at v = 0.8 c wrt the ether.

Sorry, Wolfgang

Jan 25, 2007, 8:23:14 AM1/25/07

to

news:ep8ftp$48b$1...@atlas.ip-plus.net...

> :: = Wolfgang G. Gasser in news:ep6cfd$3uk$1...@atlas.ip-plus.net :

> : = harry in news:1169630...@sicinfo3.epfl.ch :

>

> Harry:

> ::: dx' = dx/gamma (a moving rod appears to contract; thus a really

> ::: moving rod really contracts)

>

> Wolfgang:

> :: Here also you are a victim of the confusion (resp. fatal error) I'm

> :: dealing with. According to SR, dx' = dx/gamma means contraction

> :: of rest-frame distances wrt the moving frame.

>

> Harry:

> : dx = dx'/gamma is valid in S' only. It's an often made mistake ...

>

> Should this be a con trick in order to obfuscate your error above,

> or are you simply confusing dx with dx'?

> :: = Wolfgang G. Gasser in news:ep6cfd$3uk$1...@atlas.ip-plus.net :

> : = harry in news:1169630...@sicinfo3.epfl.ch :

>

> Harry:

> ::: dx' = dx/gamma (a moving rod appears to contract; thus a really

> ::: moving rod really contracts)

>

> Wolfgang:

> :: Here also you are a victim of the confusion (resp. fatal error) I'm

> :: dealing with. According to SR, dx' = dx/gamma means contraction

> :: of rest-frame distances wrt the moving frame.

>

> Harry:

> : dx = dx'/gamma is valid in S' only. It's an often made mistake ...

>

> Should this be a con trick in order to obfuscate your error above,

> or are you simply confusing dx with dx'?

Sorry, I didn't pay enough attention. Sure, the length dx' of the moving rod

as measured in its proper frame S' is measured as dx=dx'/gamma in rest frame

S.

> Your just introduced version dx = dx'/gamma actually has the meaning

> you by mistake first attributed to dx' = dx/gamma: a moving rod

> contracts wrt to the rest frame.

Yes.

> This new version dx = dx'/gamma is valid if we assume simultaneity

> in the rest frame S, i.e. dt = 0:

>

> dx' = gamma * (dx - v*dt) --> dx' = dx * gamma

> --> dx = dx' / gamma

>

> However, the version we originally have been dealing with,

> dx' = dx/gamma, implies simultaneity in S', i.e. dt' = 0:

>

> dx = gamma * (dx' + v*dt') --> dx = dx' * gamma

> --> dx' = dx / gamma

Yes. I thought that you did not understand that point; but obviously that's

not the issue...

> So S-simultaneity leads to contraction of S' wrt S (or expansion of S

> wrt S') and S'-simultaneity to contraction of S wrt S' (or expansion

> of S' wrt S).

That is the issue, as I explained below. In no inertial system does any

object appear to be "expanding".

> :: An ether distance of e.g. dx = 1 light-year is contracted to

> :: dx' = l LY / gamma in the moving-frame.

> :

> : "ether" and "is contracted" are incompatible,

>

> and Lorentz ether theory is therefore inconsistent.

No, there I pointed out to you what in your description is inconsistent.

> Let us assume a twin-paradox

That's really funny: the twin scheme was introduced as example with that

interpretation of SRT before it became a paradox due to reinterpretation.

> situation where one twin remains at rest

> in the ether whereas the other travels with v = 0.5 c to a point 1 LY

> away from the twin at rest. So an ether distance dx = l LY is passed

> in dt = 2 years.

>

> From time dilation follows that the moving twin does not need 2 years

> proper time to reach the destination but only dt' = 2 Yr / gamma. So,

> if the ether-distance dx from the twin at rest to the destination is

> identical wrt the moving twin (i.e. dx' = dx = 1 LY)

Of course not, why would you think so? I already pointed out to you that you

your formulation confuses appearance with hidden reality. That is not

allowed in that interpretation. In every frame one assumes to be in rest;

which implies that it is the others that are assumed to be moving - by

convention.

> we get wrt the

> moving twin a proper speed of:

>

> v' = dx' / dt' = dx / (dt/gamma) = v * gamma.

>

> The only way to get a moving-twin speed of v' = v is the assumption,

> that the ether distance dx = 1 LY contracts by gamma wrt the moving

> twin:

>

> dx' = dx/gamma --> dx'/dt' = (dx/gamma) / (dt/gamma) = v

>

> Time dilation is time expansion. If we combine time dilation with

> length contraction, then velocity as length divided by time obviously

> cannot remain invariant. Therefore we must combine time dilation of

> a moving object with with length expansion of the object (equivalent

> to contraction of the rest frame).

See above: nothing expands.

> : I think that [] you misunderstand what the author of mathpages wrote.

>

> Try again: news:ep2hvi$qli$1...@atlas.ip-plus.net

>

> Interestingly the LET-SR confusion, we are dealing with, shows up as

> a different incarnation in the article you've pointed to. There you

> write:

>

> "Similarly, the clocks will tick at 3/5 of the rate in rest, making

> one tick 0.6 s of duration. Because this is determined relative to

> the stationary ether or absolute space, the effects correspond to

> physical reality."

> http://groups.google.com/group/sci.physics.relativity/msg/9db6b5df54b79f1d

>

> If the clock rate of a moving clock is 3/5 of the rate of rest-frame

> clocks, then one moving-clock cycle does not result in 0.6 sec in the

> rest frame, but in 5/3 sec.

Hmm, it looks like you found a nasty little error. Indeed, one second

corresponds to 0.6 ticks. Note that the error is only in the intro.

> Imagine simply a transversal light clock

> moving at v = 0.8 c wrt the ether.

>

> Sorry, Wolfgang

Why? Thanks for noticing the error, I'll correct it.

And sorry that due to it, you didn't read on - for then you would not have

made the mistake above to think that moving observers should apply their

state of motion inconsistenlty. BTW, you can similarly mess up Newtonian

mechanics.

Regards,

Harald

Jan 25, 2007, 11:27:00 AM1/25/07

to

On Jan 22, 6:36 am, "Wolfgang G. Gasser" <z...@z.lol.li> wrote:

> Adherents of LET often make statements such as "Lorentz ether theory

> does not know any paradoxes of relative motion" [1]. Even some of

> those who adhere to Special Relativity use LET in order to defend

> SR from paradoxes. They argue that LET, based only on time dilation

> and length contraction, makes the same predictions as SRT without the

> seemingly paradox SR simultaneity concept.

>

> The perported equivalence between SR and LET however stems from an

> astonishingly huge error, exemplified in this text [2]:

>

> "... two mirrors in parallel motion, with a pulse of light bouncing

> between them. In this case the motion of the mirrors actually does

> diminish the frequency of bounces, relative to the stationary ether

> frame, because the light must travel further between each reflection.

> Thus the time intervals 'expand' (i.e., dilate). Given this time

> dilation of the local moving coordinates, it's fairly obvious

> that there must be a corresponding change in the effective space

> coordinate (since spatial lengths are directly related to time

> intervals by dx = v*dt). In other words, if an observer moves at

> speed v relative to the ground, and passes over an object of length

> L at rest on the ground, the length of the object as assessed by the

> moving observer is affected by his measure of time. Since he is

> moving at speed v, the length of the object is v*dt, where dt is the

> time it takes him to traverse the length of the object - but which

No one gives a shit about LET, so feel free to find as many real or

imagined errors as you wish.

Jan 29, 2007, 12:15:48 AM1/29/07

to

That is not a good demo.

In the MMX, the observer is always at rest wrt the apparatus.

....and you have proved again that you are a closet aetherist...

Jan 29, 2007, 12:15:51 AM1/29/07

to

LET uses REAL contractions of length and time to explain the MMX null result.

A consequence of this is that measured OWLS will always return the value 'c'.

Einstein began with the POSTULATE that measured OWLS would be c for all

differently moving observers.

He then went on to mathematically describe the features of a universe based on

this postulate.

A consequence was that relatively moving objects would apear to be conrtracted.

I have been pointing out for months that SR is nothing but LET run backwards.

Unfortunately for both theories, there is no absolute aether and there are no

contractions, either physical or observational.

The MMX result was to be expected simply because light moves at c wrt both its

source and everything at rest in the source frame.

Note: OWLS has never been measured. OWLS from differently moving sources has

never been compared. There has never been an experiment that directly supports

either SR OR LET.

'c' is a universal constant. It is also the speed of light wrt its source.

The value of c can be determined with a TWLS experiment in vacuum, in which

case, tAB = tBA and OWLS = TWLS = c.

It's all so simple. Why try to make it difficult with a red herring?

Jan 30, 2007, 12:15:05 AM1/30/07

to

"Henri Wilson" <HW@....> wrote in message news:ho0rr2pg16khti8c2...@4ax.com...

It's better than any you've made.

>

> In the MMX, the observer is always at rest wrt the apparatus.

Yeah, so ?

"To the "stationary" observer on the left the yellow path of the "tip of the ray" as Einstein calls it (which he/she never observes) "

Can't you fucking read, dumbfuck jealous ozzie?

Jan 30, 2007, 12:43:56 PM1/30/07

to

: = harry in news:1169731...@sicinfo3.epfl.ch

:: = Wolfgang G. Gasser in news:ep8ftp$48b$1...@atlas.ip-plus.net

:: = Wolfgang G. Gasser in news:ep8ftp$48b$1...@atlas.ip-plus.net

:: So S-simultaneity leads to contraction of S' wrt S (or expansion of S

:: wrt S') and S'-simultaneity to contraction of S wrt S' (or expansion

:: of S' wrt S).

: In no inertial system does any object appear to be "expanding".

Let us take a 6 m long (proper length) ruler moving at v = 0.8 c

wrt the ether, as described in your article:

http://groups.google.com/group/sci.physics.relativity/msg/9db6b5df54b79f1d

(See APPENDIX for my treatment/summary of your example)

You write that (under ether hypothesis) the ether-length dx = 3.6 m

of the contracted ruler corresponds to physical reality. Nevertheless,

you ascribe the proper length dx' = 6 m' to ruler. If we assume moving-

ruler simultaneity, i.e. dt' = 0, we get

dx = gamma * (dx' + v*dt') --> dx = gamma * dx'

= (5/3) * 6 m' = 10 m

This ether distance of 10 m has a very concrete meaning. Let us assume

that along the whole length of the ruler are small flash lamps next to

each other. If they fire all at the same time (S'-simultaneity) then

the distance between the first and the last flash is 10 m in the ether.

However, the flashes do not appear at the same time: at first appears

the flash from the rear, and 80/3 ns later the last flash from the

front. During these 26.666 ns the ruler moves 6.4 m, so increasing the

distance from the contracted length of 3.6 m to the expanded of 10 m.

Let us further assume that the flash lamps fire at t' = 0 in red,

at t' = 25 ns' in blue, at t' = 50 ns' again in red, and so on.

Because the next firing always occurs, when the rear end passes the

ether position where the flash from the font end fired the last time,

this represents a measurement of ether distances using the ruler

length of 6 m'. In the ether this results in an apparent light source

moving at 0.8 c and changing after each a unity of 10 m from red to

blue or inversely.

So it should be obvious that only inasfar (i.e. S'-simultaneity) as

the ruler expands from 6 m' to 10 m wrt the ether, ether distances

can contract wrt the ruler, e.g. from 6 m to 3.6 m'.

See also:

http://groups.google.com/group/sci.physics.relativity/msg/2a0f373cafaf3b3a

Your assumptions

- real contraction of moving objects wrt the ether

- no (real) contraction of ether distances wrt moving objects

- no (apparent) expansion of moving objects wrt the ether

are inconsistent with the principle of "apparent relativity" (i.e.

apparent/empirical equality of moving frames with the ether frame).

Therefore, I concluded that you and others at least sometimes confuse

"contraction of ether distances wrt moving objects" with "contraction

of these moving objects wrt to the ether". Nevertheless, the "fatal

error in LET" I'm dealing with disappears if we accept: apparent

expansion of moving objects caused by local Poincaré-simultaneity.

There is however a major empirically relevant difference between

SR and LET:

Assume a small spherical homogenous light source at the center of

a sphere with a diameter of 6 m. If the sphere is at rest in the

ether, the light intensity received from the source by the inner

surface of the sphere is obviously homogenous. Now let us assume

that the sphere moves at 0.8 c (and light propagates isotropically)

wrt the ether. Both the light source and the surrounding sphere are

contracted, resulting in analogous ellipsoids. Nevertheless, the ether

drift of -0.8 c (think about aberration) would strongly increase the

light intensity at the rear end at the expense of the front end.

(Received frequencies are the same.)

See also:

http://groups.google.com/group/sci.physics.relativity/msg/583757ad63031a21

At least in this case it is obvious, that length contraction and

time dilation are not enough to simulate the predictions of special

relativity.

Cheers, Wolfgang

________________________________________________________________________

APPENDIX:

A ruler with a rest length of 6 m passes at v = 0.8 c a rod of the

same length at rest in the ether.

The length dL' = 6 m' of the ruler is contracted by gamma in the ether:

gamma = 1/sqrt(1-v^2/c^2) = 1/sqrt(1-0.8^2) = 5/3 = 1.666

dL = dL' / gamma = 6 m' / (5/3) = 3.6 m

Time intervals dt' of clocks fixed on the ruler (x' = const) are

dilated/expanded wrt to the ether time: dt = dt' * gamma

ruler --> v = 0.8c

|--------+--------| rod

|=============================| v = 0

< - - 3.6 m - - > < - - - - - 6 m - - - - - >

< - - - - - - - - - - 10 m - - - - - - - - - - >

Clocks on both ends of the ruler are synchronized using a light signal

from the center of the ruler. In the ether system, the light signal to

the right clock (in front) needs

1.8 m / (c-v) = 1.8 m / 0.2 c = 30 ns

and passes an ether distance of 30 ns * c = 9 m. The light signal to

the left clock (in the rear) needs only

1.8 m / (c+v) ) 1.8 m / 1.8 c = 10/3 ns = 3.333 ns

and passes an ether distance of only 3.333 ns * c = 1 m. Thus in the

ether, the rear clock is ahead of the front clock by:

time_offset = 30 ns - 10/3 ns = 80/3 ns = 26.666 ns

Wrt the dilated/expanded time of the moving clocks, the time offset' is

time_offset / gamma = 26.666 ns * (3/5) = 16 ns'.

t'=0 t'=-16ns'

|--------+--------|

|=============================|

Fig. 1

t'=1ns' t'=-15ns'

|--------+--------|

|=============================|

Fig. 2

t'=10ns' t'=-6ns'

|--------+--------|

Fig. 3 |=============================|

t'=16ns' t'=0

|--------+--------|

Fig. 4 |=============================|

t'=25ns' 9ns'

|--------+--------|

Fig. 5 |=============================|

Let us define t' = 0 as the moment, the right clock of the ruler

passes the right end of the rod (Fig. 3). The left clock then

(ether simultaneity) indicates t' = 16 ns'.

The distance passed by the left clock of the ruler between Fig 1. and

Fig 4. is 10 m. During a movement of 10 meters a clock advances (proper

time) by

dt' = 10 m / 0.8 c * gamma = 10 m = (0.24 m/ns) / (5/3) = 25 ns'

In order to determine the proper speed v' as measured from the moving

ruler, we can use Fig. 4 und Fig. 5. The right end of the rod passes

at t' = 0 the right clock of the ruler, and at t' = 25 ns' the left

clock. So wrt the ruler, the right rod end moves dL' = 6 m' in

dt' = 25 ns', resulting in a proper speed of v' = dL'/dt' = 0.8 c.

In order to determine length contraction of the rod at rest wrt to

the moving ruler, we can take the left ruler end of Fig. 1 and the

right ruler end of Fig. 4, both at the same local time t' = 0. The

distance between these two ends is 10 m in the ether. And because to

these 10 m corresponds a proper length of 6 m', the 6 m long rod

contracts to 6 m' * (6 m / 10 m) = 3.6 m' wrt the ruler.

Jan 30, 2007, 5:12:27 PM1/30/07

to

On Tue, 30 Jan 2007 05:15:05 GMT, "Dumbledore_" <Headm...@hogwarts.physics_q>

wrote:

wrote:

How about: http://www.users.bigpond.com/hewn/movingframe.exe

You are really demonstrating the light clock principle, not the MMX.

The MMX requires that you explain the difference in travel times between the

parallel and transverse rays for different speeds through the 'aether'.

>> In the MMX, the observer is always at rest wrt the apparatus.

>

>Yeah, so ?

>

>"To the "stationary" observer on the left the yellow path of the "tip of the ray" as Einstein calls it (which he/she never observes) "

>

>Can't you fucking read, dumbfuck jealous ozzie?

There is only one observer who is always stationary wrt the apparatus.

Why don't you demonstrate a light clock?

Feb 1, 2007, 6:04:23 AM2/1/07

to

news:epo02c$27l$1...@atlas.ip-plus.net...

>: = harry in news:1169731...@sicinfo3.epfl.ch

> :: = Wolfgang G. Gasser in news:ep8ftp$48b$1...@atlas.ip-plus.net

>

> :: So S-simultaneity leads to contraction of S' wrt S (or expansion of S

> :: wrt S') and S'-simultaneity to contraction of S wrt S' (or expansion

> :: of S' wrt S).

>

> : In no inertial system does any object appear to be "expanding".

>

> Let us take a 6 m long (proper length) ruler moving at v = 0.8 c

> wrt the ether, as described in your article:

> http://groups.google.com/group/sci.physics.relativity/msg/9db6b5df54b79f1d

> (See APPENDIX for my treatment/summary of your example)

>: = harry in news:1169731...@sicinfo3.epfl.ch

> :: = Wolfgang G. Gasser in news:ep8ftp$48b$1...@atlas.ip-plus.net

>

> :: So S-simultaneity leads to contraction of S' wrt S (or expansion of S

> :: wrt S') and S'-simultaneity to contraction of S wrt S' (or expansion

> :: of S' wrt S).

>

> : In no inertial system does any object appear to be "expanding".

>

> Let us take a 6 m long (proper length) ruler moving at v = 0.8 c

> wrt the ether, as described in your article:

> http://groups.google.com/group/sci.physics.relativity/msg/9db6b5df54b79f1d

> (See APPENDIX for my treatment/summary of your example)

I didn't check in detail, but apparently you found no error.

> You write that (under ether hypothesis) the ether-length dx = 3.6 m

> of the contracted ruler corresponds to physical reality.

It just means declaring one inertial frame to be "really" at rest.

> Nevertheless,

> you ascribe the proper length dx' = 6 m' to ruler. If we assume moving-

> ruler simultaneity, i.e. dt' = 0, we get

>

> dx = gamma * (dx' + v*dt') --> dx = gamma * dx'

> = (5/3) * 6 m' = 10 m

>

> This ether distance of 10 m has a very concrete meaning.

Sure it does. In words: the proper distance of 10 m in S is measured in S'

as spanning only 6 m.

Similarly, a proper distance of 10 m in S' is measured in S as spanning only

6 m.

Thus a proper distance of 10 m is measured in the other frame as a moving

distance that appears to be *contracted* to only 6 m.

Of course, you could say that in SRT one has an "expanded" view of the

moving distance that is at any time next to one's ruler due to the apparent

contraction of the moving system. That is however only good for confusing

matters. Clearly, you managed to confuse yourself with it.

[skip more talk about expansion]

> Your assumptions

>

> - real contraction of moving objects wrt the ether

> - no (real) contraction of ether distances wrt moving objects

> - no (apparent) expansion of moving objects wrt the ether

The brackets make your above statements ambiguous, and in principle

selfcontradictory.

Instead, you were discussing the original interpretation of SRT according to

which one unknown inertial frame corresponds to the ether, so that one has

as metaphysics:

- contraction of moving objects wrt the ether

- apparent contraction of ether distances wrt a moving inertial frame (that

is assumed to be at rest, by convention)

> are inconsistent with the principle of "apparent relativity" (i.e.

> apparent/empirical equality of moving frames with the ether frame).

>

> Therefore, I concluded that you and others at least sometimes confuse

> "contraction of ether distances wrt moving objects" with "contraction

> of these moving objects wrt to the ether". Nevertheless, the "fatal

> error in LET" I'm dealing with disappears if we accept: apparent

> expansion of moving objects caused by local Poincaré-simultaneity.

That is incompatible with SRT. I must conclude that your version of SRT is

erroneous.

> There is however a major empirically relevant difference between

> SR and LET:

>

> Assume a small spherical homogenous light source at the center of

> a sphere with a diameter of 6 m. If the sphere is at rest in the

> ether, the light intensity received from the source by the inner

> surface of the sphere is obviously homogenous. Now let us assume

> that the sphere moves at 0.8 c (and light propagates isotropically)

> wrt the ether. Both the light source and the surrounding sphere are

> contracted, resulting in analogous ellipsoids. Nevertheless, the ether

> drift of -0.8 c (think about aberration) would strongly increase the

> light intensity at the rear end at the expense of the front end.

I can make no sense of that last sentence, but your reference below

clarifies it.

> (Received frequencies are the same.)

>

> See also:

> http://groups.google.com/group/sci.physics.relativity/msg/583757ad63031a21

>

> At least in this case it is obvious, that length contraction and

> time dilation are not enough to simulate the predictions of special

> relativity.

I see that also Tom Roberts tried in the past but could not get through to

you - thus I won't try more after this.

Now I copy your stuff here, and will comment only this time:

On Feb 2 2000, 9:00 am, "z@z" <z...@z.lol.li> wrote:

> : = Tom Roberts

> :: = Wolfgang G.

>

> :: But I cannot believe that the basic asymmetry in the ether has no

> :: effect at all. Isn't there a problem with the intensity of light?

If there were, then this would "kill" SRT - the math is identical.

> :: Intensity is inversely proportional to the distance square. If the

> :: ether is the medium of light, then light intensity decreases with

> :: ether distance, doesn't it?

> :

> : Yes, when measured in the ether frame. But intensity is also

> : proportional to the solid angle subtended by the detector, and

> : _that_ is not invariant. Do the computation and you will find

> : that competing effects cancel out exactly.

>

> | - - - - - - - o - - - - - - - |

> detector source of detector

> sound

>

> The sound intensity registered by the two detectors, unlike the

> measured frequency, is not independent of the speed of the medium

> (the air) wrt the system.

>

> A spherical light wave is Lorentz invariant:

>

> x^2 + y^2 + z^2 = (ct)^2 --> x'^2 + y^2 + z^2 = (ct')^2

>

> But I don't think that all segments corresponding to given solid

> angles are Lorentz invariant in the same way. We can for instance

> divide the original spherical wave into two parts separated by

> the circularly propagating wave

>

> x = 0, y^2 + z^2 = (ct)^2

>

> Thinking about stellar aberration is enough to recognize that

> this circular wave cannot be Lorentz-transformed to

>

> x' = 0, y^2 + z^2 = (ct')^2

>

> This means that if the number of photons per solid angle is

> uniform in the system at rest then it cannot be uniform in the

> moving system and vice versa.

>

> In SR it is reasonable to assume that it is always the frame

> of the source where the number of photons per solid angle is

> uniform. I doubt however that this is a reasonable assumption

> in an ether theory.

Why? it's a matter of momentum conservation. Even more, Ives *derived* SRT

based on the ether postulate plus conservation of energy and momentum.

> | - - - - - - - o - - - - - - - | -->

> detector spherical detector v

> light source

>

> Let us assume that this system moves at v = sqrt(0.99)c wrt the

> ether and that the distance between the source and each dectector

> is compressed from 10 m (restlength) to 1 m in the ether.

I can't make sense of that sentence...

> Whereas light to the right detector has to travel over 199.5 m in

> the ether, the light path to the opposite detector is only 0.5 m.

> 1 m / (1 - sqrt(0.99) = 199.5 m

> 1 m / (1 + sqrt(0.99) = 0.5 m

>

> The sound analogy would result in an intensity difference

> factor of (199.5 m / 0.5 m)^2. So the intensity registered by

> the left dectector would be (at least) 159 thousand times

> stronger than by the right detector.

Maybe you think that as measured in the rest frame (or ether frame), the

light will be emitted uniformly. Tom Roberts already told you that that is

not so. Experiments with moving gamma sources confirm that the radiation is

concentrated forward, as theory predicts: what is sent out under a straight

angle in the moving frame, is sent out nearly straight forward in the lab

frame.

> Wolfgang Gottfried G. (0:032.6)

> Cheers, Wolfgang

Good luck,

Harald

Feb 1, 2007, 1:50:36 PM2/1/07

to

"Henri Wilson" <HW@....> wrote in message news:l4gvr2tiilng82746...@4ax.com...

Bullshit, Albert Michelson had his buddy Edward Morley take a look.

You think he was jumping up and down?

>

> Why don't you demonstrate a light clock?

I did, I even built one. It's still working.

http://www.androcles01.pwp.blueyonder.co.uk/lightclock.gif

LEDs and NAND gates are pretty cheap, the mirrors were

more expensive. I took the capacitor out, it wasn't needed.

http://www.allaboutcircuits.com/vol_4/chpt_3/6.html

That reminds me, I've got to get the step ladder and dust it.

I put it close to the ceiling so as not to interrupt the beam,

it goes right around the walls with mirrors.

Oh well, that can wait until Spring.

Feb 2, 2007, 5:55:19 PM2/2/07

to

harry wrote in news:1170327...@sicinfo3.epfl.ch :

: Of course, you could say that in SRT one has an "expanded" view of the

: moving distance that is at any time next to one's ruler due to the

: apparent contraction of the moving system.

My impression is that our positions have converged at least a little.

And such a convergence of different beliefs should be a goal in any

discussion. Here I'll content myself with a revised version of the

contraction/expansion part of my previous posting.

Cheers, Wolfgang

________________________________________________________________________

Let us take a 6 m long (rest length) ruler moving at v = 0.8 c in

the ether, as described in the article:

http://groups.google.com/group/sci.physics.relativity/msg/9db6b5df54b79f1d

(See APPENDIX for my treatment/summary of the example)

In Lorentz ether theory the ether-length dx = 3.6 m of the contracted

ruler corresponds to physical reality. Nevertheless, a local "proper

length" of dx' = 6 m' is ascribed to the ruler. If we assume moving-

ruler simultaneity dt' = 0, we get from the Lorentz transformation:

dx = gamma * (dx' + v*dt') --> dx = gamma * dx'

= (5/3) * 6 m' = 10 m

This ether distance of 10 m has a very concrete meaning. Let us assume

that along the whole length of the ruler are small flash lamps next to

each other. If they fire all at the same time (S'-simultaneity) then

the distance between the first and the last flash is 10 m in the ether.

However, the flashes do not appear at the same time in the ether

(S-simultaneity): at first appears the flash from the rear end, and

80/3 nano-seconds later the last flash from the front end. During

these 26.666 ns the ruler moves 6.4 m, so increasing the distance

from the contracted length of 3.6 m to the expanded of 10 m.

Let us further assume that the flash lamps fire at t' = 0 in red,

at t' = 25 ns' in blue, at t' = 50 ns' again in red, and so on.

Because the next firing always occurs, when the rear end passes the

ether position where the flash from the front end fired the last time,

this represents a measurement of ether distances using the ruler

length of 6 m'. In the ether this results in a light source apparently

moving at 0.8 c and changing after each a length unit of 10 m from

red to blue or inversely.

So it should be obvious that only inasfar (S'-simultaneity) as the

ruler expands from 6 m' to 10 m wrt the ether, ether distances can

contract wrt the ruler, e.g. from 6 m to 3.6 m'.

So in Lorentz ether theory, three basic length-unit changes can be

distinguished:

1) Contraction of objects moving wrt the ether, caused by concrete

physical effects

2) Expansion of moving objects, caused by different durations

(wrt ether simultaneity) of the movements of the different

points of the moving objects

3) Apparent contraction of the ether, resulting from the expanded

length units of moving objects.

The expanded length of a moving object is physically real also

inasfar, as it is the sum of the paths of synchronization light

signals from the center to both ends. For an apparent contraction

of ether distances wrt the WHOLE moving object, it is therefore

required that the FRONT END of the contracted object moves

inertially long enough in the ether, so that ITS distance from

the rear end can increase from L/gamma to L*gamma.

Let us assume a ruler with rest length of 2 light years moving at

v = 0.9999995 c (gamma = 1000). So the distances from the center to

each end are contracted to 0.001 LY wrt the ether. Ether distances

passed by synchronization light signals from the center to the rear

and to the front each are:

to_rear = 0.001 LY / (c + v) * c = 0.0005 LY

to_front = 0.001 LY / (c - v) * c = 1999.9995 LY

------------

2000.0000 LY

The physical expansion in the ether from the contracted 0.002 LY to

2000 LY is caused by constant MOVEMENT of the front, STARTING when

the rear after 0.0005 years receives the synchronization signal, and

ENDING 1999.999 years later when also the front receives the signal.

Such expansions by physical movement are a precondition for any

apparent contraction of ether distances wrt to moving objects.

As an accentuation of the thought experiment, let us ask what

happens if the 2 LY long ruler performs a circular movement with

an orbit of 2000 LY. In the ether, the length of the ruler is

contracted to 0.002 LY. As measured by the ruler, the orbit must

contract in the same way as local time is expanded, because

otherwise dx'/dt' does not result in v.

Thus the 2 LY' long moving ruler has to ascribe the same length

to the orbit as to itself: 2000 LY / gamma = 2 LY'. This means

concretely: under moving-ruler simultaneity', the ruler is expanded

over the whole 2000 LY of the orbit, and the front of the ruler is

next to the rear at the same time'.

________________________________________________________________________

APPENDIX:

passes the right end of the rod (Fig. 4). The left clock then

(ether simultaneity) indicates t' = 16 ns'.

The distance passed by the left clock of the ruler between Fig 1. and

Fig 5. is 10 m. During a movement of 10 meters a clock advances (local

time) by

dt' = 10 m / 0.8 c * gamma = 10 m = (0.24 m/ns) / (5/3) = 25 ns'

In order to determine the proper speed v' as measured from the moving

ruler, we can use Fig. 4 und Fig. 5. The right end of the rod passes

at t' = 0 the right clock of the ruler, and at t' = 25 ns' the left

clock. So wrt the ruler, the right rod end moves dL' = 6 m' in

dt' = 25 ns', resulting in a proper speed of v' = dL'/dt' = 0.8 c.

In order to determine length contraction of the rod at rest wrt to

the moving ruler, we can take the left ruler end of Fig. 1 and the

right ruler end of Fig. 4, both at the same local time t' = 0. The

distance between these two ends is 10 m in the ether. And because to

these 10 m corresponds a proper length of 6 m', the 6 m long rod

contracts to 6 m' * (6 m / 10 m) = 3.6 m' wrt the ruler.

_______________

-- The Lorentz transformation today plays the role the principle

-- of circular motion played in the old (pre-Keplerian) astronomy

Feb 7, 2007, 4:51:29 AM2/7/07

to

Absolutely. LET says that if this and that contract or whatever in

accordance with Lorentz transforms you will always get c for the speed

of light. Einstein says if you always get c as the speed of light it

must be because this and that contracts or whatever in accordance with

Lorentz transforms.

Lorentz was trying to explain why we always appear to be stationary

w.r.t. the aether (interpretation of the MMX if you believe in Maxwells

aether). Starting with the aether and working towards that result.

Einstein started with the result - That we always are stationary w.r.t

the aether (interpretation of the MMX if you believe in Maxwells aether)

- which is exactly what the second postulate is describing - an observer

stationary w.r.t the aether.

As I have said before Einstein objected to the asymmetry in the

theoretical structure of Lorentz's theory and avoided it by producing a

theory with no theoretical structure.

It takes a genius to pull that sort of stunt and get away with it.

It is hardly a surprise that SR has no theoretical structure. Einstein

made a vague attempt, hinting at an aether which was such that every

observer would naturally find himself stationary w.r.t it but today,

with 'aether' being a taboo word, you would have to come up with a

theoretical structure which is consistent with the idea that the speed

at which light leaves a source is somehow solely dependent upon an

observer who at a vast distance may at some date in the far future,

observe it.

>

>Unfortunately for both theories, there is no absolute aether and there are no

>contractions, either physical or observational.

That is the daft part. That there is no aether is now generally accepted

which makes the acceptance of the Lorentz/Einstein 'aether fix'

absolutely bonkers. Self deception on a grand scale. They have spent a

100years building on a decision which makes no sense when viewed with

today's belief in 'no aether'. They say "It must have been the right

decision because we have spent 100 years building on it". I think its

called being objective :^)

Relativity did not conform to what one would expect of a physical theory

but "relativity is right" therefore what is expected of a physics theory

has been changed. There is now no quality assurance. You cannot dismiss

a theory on the grounds that it is silly.

>The MMX result was to be expected simply because light moves at c wrt both its

>source and everything at rest in the source frame.

That is certainly the most obvious interpretation of the null result and

the one which one would naturally plump for if one wasn't hung up on a

historical belief that light was a wave travelling in the aether who's

speed could not therefore be dependent upon the source. If one accepts

there is no aether it is the only logical interpretation of the MMX. You

only have a 'source' - an 'observer' and 'the space in between' if you

accept that 'the space in between' contains nothing which can influence

the speed of light you are left with a source and an observer and there

is no way the observer can control the transfer at a distance and back

through time.

>Note: OWLS has never been measured. OWLS from differently moving sources has

>never been compared. There has never been an experiment that directly supports

>either SR OR LET.

To be fair it is incredibly difficult to come up with an experiment to

distinguish. Even more difficult to come up with one which could deal

with all possible objections. Having said that it is absolutely amazing

how many people who should know better assume that such experiments are

performed every day. The underlying assumption is that if results are as

predicted by relativity they somehow disprove source dependence.

A B

If you have light travelling between A and B with a speed c w.r.t A then

the only thing which tells you whether it is SR or Ballistic theory is

which direction the light is travelling in. Mathematically that in turn

depends on which direction time is going. Mathematically 'source' and

'destination' are simply labels. Relativity seems weird but gives the

right answer because it is describing things with time going backwards

which you can't tell from the maths.

>

>'c' is a universal constant. It is also the speed of light wrt its source.

>

>The value of c can be determined with a TWLS experiment in vacuum, in which

>case, tAB = tBA and OWLS = TWLS = c.

>

>It's all so simple. Why try to make it difficult with a red herring?

--

John Kennaugh

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