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Because of CPT symmetry, an observer would see the same lensing effect irrespective if the lens is made from matter or antimatter.
The null geodesic of the photon (or antiphoton) must remain the same for the laws of physics to remain invariant otherwise the symmetry is violated.
The problem I see with this model is that there is no explanation as to why "dark energy" is increasing.
Due to the metric expansion of the Universe one would expect the effects of anti-gravity, like gravity, to decrease as the density of the Universe decreases with time.
Regards
Steven
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