sci.physics.particle

On Feb 25, 2:16=A0am, Eric Gisse wrote:
> On Feb 24, 9:28 pm, "Y.Porat" wrote:
>
> > On Feb 24, 11:25 pm, "chu...@gmail.com" 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 sheet or something), and that curve is
> > > Gravity, and when light passes through the curve it bends....but why?
>
> > --------------------
> > just forget about curved spacetime
> > light bends next topthe sun
> > becuase of the most simple reason
> > LIGHT HAS MASS !!!
>
> You are amazingly sure of this despite not having one shred of
> evidence to support your claim. Then again, it is more important to be
> original than be right, eh?
>
> > (even Einstein ddint know to read his momentous formula
>
> > E=3Dmc^2
>
> Show us the calculation of the deflection angle given the assumption
> that photons have mass.

The reason that all text particles fall at the same rate given the
same inititial conditions is because the gravitational mass equals the
inertial mass and therefore the mass cancelts out in the equatuions of
motion. Einstein predicted that light is deflected in a gravitational
field because light has energy and energy has mass. Your reqest for
such a derivation can't even be given for a particle *with* non-zero
rest mass for this reason. The mass simply doesn't appear in the
equations. However I could find Einstein's or Feynman's arguements for
the deflection of light based on the postulate the light has passive
gravitational mass if you'd like?

Pete