On Jan 3, 11:03 am, "Ken S. Tucker" <
dynam...@vianet.on.ca> wrote:
> > Let's subject that to a theoretical experiment, using
> > the axis of time (x^0 =ct) only, to produce,
>
> > g_00 = x_0 ; 0 - [00,0} x^0 Eq.(4.0)
>
> > I'll try using the symbol ' Φ ' for gravitational potential,
> > and follow GR's
>
> > g_00 = 1 - 2Φ
>
> > as a test.
>
> > The Christoffel reduces to,
>
> > [00,0] = 1/2 g_00,0
>
> > wherein we'll presume the x^0 = r in Φ = (GM/rc^2),
> > to give us,
>
>> 1/2 g_00,0 = Φ/x^0
> > that subs into Eq.(4.0) to provide,
>
> > g_00 = x_0 ; 0 - Φ Eq.(4.1).
>
> > That in turn yields,
>
> > x_0 ; 0 = 1 - Φ .
>
> > and everything balances, quite nicely.
> > From that we can conclude the Generalized metric tensor
> > is in accord with GR at 1st glance.
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As a calculus student many names of derivatives are encountered.
A beginnners list is,
1) Ordinary uses d
2) Partial uses ∂
those together makes a
3) Total derivative by summing the
partials ( ∂ ) of independant variables.
4) GRAD is the maximum slope of a curve,
usually a Vector Analysis thing.
Now is the "covariant derivative" applied to any rank of tensor,
D (x^ijj.._abc...) / D parameter(s)
(usually a single parameter).
That in turn yields up the "Intrinsic, iow's absolute" derivative,
δ(tensor) =D (tensor) / D (parameters) x D (parameters)
I'm having a problem expressing "covariant" and "absolute"
derivatives in English.
Allow me to provide a physical example.
Let U^μ be a points relative velocity in 4D.
((In terms of relativity U_i = 0 , i=1,2,3, removes absolute
uniform velocity, U_i is a covariant 3 vector in space))
Then the absolute derivative of U^μ ,expressed as
δ ( U^μ ) = 0 (1)
as absolute acceleration cannot exist. That's naturally
common sense, since one may place the CS origin
attached to any point, and the Laws of Nature apply
in that Generally Relativistic.
Eq.(1) makes GR straight forward as does the explanation
provided.
I ride two ways, math & physics, here's a sample
that unifies them,
Let a flat line be X.
Let a minimum variation from a flat line be "h".
Allow the variation to be expressed by,
S^2 = X^2 + h
I enable S dS = X dX and S ∆S = X ∆X.
to enable the continuum in the 1st place and a quantized
variation in the incremental form in the later.
(( I'm unifying continuum and incremental derivarives ))
As a theoretician I wear two hats,
math LHS and physics RHS (as above) enabling both.
That way I circumvent the philosophy of a prejudicial
formation as to 'is the universe a continuum or quantized'
Regards
Ken S. Tucker
ΣΘΛΞΠΣΦΨΩαβγδεζηθκλμνξπρφψ∂∆∑√∫≈≠≡⌠⌡⌡