Re: Why does light bend under gravity?


<franklinhu@xxxxxxxxx> wrote in message
news:61ce2955-14bb-4817-ab98-4f9b9751bf9e@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Mar 6, 3:25 pm, PD <TheDraperFam...@xxxxxxxxx> wrote:
On Mar 6, 3:22 pm, frankli...@xxxxxxxxx wrote:





On Feb 27, 10:22 am, PD <TheDraperFam...@xxxxxxxxx> wrote:

On Feb 26, 3:27 pm, NoEinstein <noeinst...@xxxxxxxxxxxxx> wrote:

On Feb 24, 4:25 pm, "chu...@xxxxxxxxx" <chu...@xxxxxxxxx> wrote:

Ok...so I've been wondering how on earth does gravity bend light,
I
mean I read all about how Einstein's General Relativity describes
space-time, and when there's a mass in space-time it creates a
curve(Bowling ball on a *** or something), and that curve is
Gravity, and when light passes through the curve it bends....but
why?

Dear Chutsu: Einstein has absolutely nothing to do with why light
bends in passing by, say, the eclipsed Sun. Massive objects like the
Sun have a whirling gob of ether that increases in density the
closer
to the surface of the Sun you go, and such density corresponds to
the
inverse square law. Light passing through the Sun's ether glob will
be bent similar to the way desert mirages bend light, or the way
glass
with varying indexes of refraction would do (if there were such a
glass). Please, Guys, get Einstein out of your minds as an
explanation for anything! -- NoEinstein --

Ah, except the bending doesn't quite go as the inverse square law.
Damn! There's that ridiculous requirement that the theory agree with
measurements again!- Hide quoted text -

- Show quoted text -

How exactly, do you know that the bending does not go as the inverse
square law? This is the analysis I am looking for to determine whether
a gravity caused refraction effect is what is causing the bending. Do
you have a reference for this analysis?

Sure. You can pick up Wald's book on General Relativity, if you like.-
Hide quoted text -

- Show quoted text -

| At best, that would only show that bending is consistent with the
| relativity explanation of the bending. It would not show that it is
| inconsistent with and inverse square force causing a increase in
| density which causes refraction effects. What I am looking for is
| something that relates the speed of light in relation to the radius
| from a gravitational source as being the proportional as the velocity
| of a wave through a medium that increases with an inverse square force
| or something which shows this can't be done.

At best, what you are looking for would only show that bending is
consistent with the medium explanation of the bending.
This is what requires explaining:
http://antwrp.gsfc.nasa.gov/apod/ap040627.html
http://antwrp.gsfc.nasa.gov/apod/ap011007.html
Not this:
http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/optpic/brokpen.jpg

You won't find much explanation of either in Wald's book on General
Relativity, though. Phuckwit Duck is too poor a mathematician to
understand it himself but he wants to appear important.


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