sci.physics

On Mon, 25 Feb 2008 20:24:50 +0100, "Paul B. Andersen"
<@> wrote:

>Juan R. González-Álvarez skrev:
>> Tom Roberts wrote on Mon, 25 Feb 2008 15:47:04 +0000:
>>
>>> The best model we have for the propagation of light near a massive
>>
>> no.
>>
>>> 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.
>>
>> Theories without spacetime curvature also agree with that.
>>
>
>Could you name one of those theories, please?

1.

The river model of black holes
/abs/gr-qc/0411060

"In the river model, space itself flows like a river through a flat
background, while objects move through the river according to the
rules of special relativity. In a spherical black hole, the river of
space falls into the black hole at the Newtonian escape velocity,
hitting the speed of light at the horizon."

(This provides an easy way to visualize why light cannot escape from
the horizon of a black hole. If light travels at the speed of light
relative space inflowing at the same speed, it can't go anywhere.)

Further away from the horizon, the flow of space towards the black
hole will bend a beam of light exactly as predicted as GR.

(The above model is actually just a particular way of applying GR.)


2.

3-Space In-Flow Theory of Gravity: Boreholes, Blackholes and the Fine
Structure Constant
/abs/physics/0512109

"A theory of 3-space explains the phenomenon of gravity as arising
from the time-dependence and inhomogeneity of the differential flow of
this 3-space."

This theory models gravity in an analogous way to the river model, but
it is derived independently of GR.