Group: sci.physics.particle
From: Sam Wormley
Date: Sunday, March 02, 2008 12:26 AM
Subject: Re: Why does light bend under gravity?

Koobee Wublee wrote:
> On Feb 25, 7:47 am, Tom Roberts wrote:
>
>> The best model we have for the propagation of light near a massive
>> object like the sun is GR, in which the curvature of spacetime is the
>> important aspect in determining the path light follows. And it agrees
>> with measurements to part-per-million accuracy over an enormous range.
>
> First, derive a set of geodesic equations a massed particle traveling
> at high speed near the sun. Then, gradually reducing the mass to zero
> and increasing the speed to c, do you see a discontinuity at mass = 0
> and speed = c?
>
> As you know, the geodesic equations are independent of mass. What
> does that tell you when the model predicts a 1x deflection traveling
> at speed just a hair below c and suddenly jumps to 2x deflection at
> speed = c?
>
> F*cked up.

Yup, you are.