Quote:
Originally Posted by CraigS
Folks;
Lensing results in path, and hence image, distortion of the background object. There is no single focussing point. There is a line along which light is bent towards, but this only indicates the centre of mass of the 'lens'. There is no 'convergence' and thus, no 'divergence'.
As such, 'divergence' of the light paths, if the 'lens' is composed of anti-matter would be pure conjecture, which I'm happy to challenge.
Cheers
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There's was no mention of any focusing point at all. Just divergent paths due to a repulsive force being propagated within spacetime. Whether it's gravity or "anti-gravity" that is being observed, so long as the phenomenon is conserving CPT symmetry (for that system) there is no violation of the physical laws. Even if it looks "dodgy" to our experience.
Remember, a gravitational field bends light towards the centre of gravity because spacetime bends inwards towards that centre. Any repulsive force, i.e. antigravity, would act in the opposite manner and you would get divergent light paths through that section of spacetime (in our estimation). This is all happening on the proviso that the negative field exists around discrete objects and is not a function of expanding spacetime (i.e. acceleration due to "dark energy"). The fact that they haven't observed anything like this in reality says that it probably doesn't occur.
The only way for a gravitational lens to look exactly the same for both regions is if there was an instantaneous switch in CPT symmetry for any photons crossing from one region to another, otherwise we'd be getting all sorts of weird effects.