On Thursday, November 12, 2015 at 3:34:10 AM UTC-7, Pentcho Valev wrote:
>
> The deflection of light by massive objects implies that the speed of light
> falling towards the source of gravity INCREASES.
Only according to Newtonian theory, but not according to relativity.
> According to the Newtonian theory, it increases like the the speed of
> ordinary falling bodies - in the gravitational field of the Earth the
> acceleration of falling photons is g.
Yes, so Pentcho was being dishonest when he put his first sentence
before the reference to Newton.
> In Einstein's general relativity, the deflection is twice that predicted
> by the Newtonian theory, which implies that the speed of light falling
> towards the source of gravity increases twice as fast as in the Newtonian
> theory - in the gravitational field of the Earth the acceleration of
> falling photons is 2g:
Prevaricating Pentcho is conflating two different scenarios: "deflection"
and "falling."
>
http://arxiv.org/pdf/gr-qc/9909014v1.pdf
> Steve Carlip: "It is well known that the deflection of light is twice that
> predicted by Newtonian theory; in this sense, at least, light falls with
> twice the acceleration of ordinary "slow" matter."
Puerile Pentcho perfidiously prefers to ignore the phrase, "in this sense"
> Actually Einstein's general relativity predicts that the speed of falling
> light DECREASES
This is what the Schwarzschild metric predicts AS VIEWED BY A DISTANT
OBSERVER. A local observer would see no change in speed. Preposterous
Pentcho prevaricates perpetually.
> - in the gravitational field of the Earth the acceleration
> of falling photons is NEGATIVE, -2g:
>
http://www.physlink.com/Education/AskExperts/ae13.cfm
> "Contrary to intuition, the speed of light (properly defined) decreases
> as the black hole is approached."
This, of course, is from the viewpoint of a distant observer. When light
passes a large gravitating body, there is a delay in the reception of the
light. It's called Shapiro delay. This experiment has been performed
many times, is in agreement with GR and refutes Newtonian theory:
http://www.relativity.li/en/epstein2/read/i0_en/i3_en/
"Shapiro lowered the imprecision of his initial measurements from over 3%
to less than 1% in subsequent years. Newer versions of this experiment work
with transponders on space probes. These receive the signal from the earth
and after a precisely known delay send it with increased intensity back to
earth. Thus with the Viking Mars probe of 1979 the predictions of the GTR
for this delay in the gravitational field of the sun could be confirmed to
an accuracy of 0.1%. In 2003, with the space probe Cassini an accuracy of
0.0012% was achieved!"
So the absurdity here is Petulant Pentcho's preposterous poppycock.
Gary