Response to "CPT symmetry and antimatter gravity in general relativity"

Details Response to "CPT symmetry and antimatter gravity in general relativity" Response to "CPT symmetry and antimatter gravity in general relativity"

2011-08-25

arxiv.org/abs/1108.5117v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Response to arXiv:1103.4937v1 [gr-qc]

Scientific paper

The observed accelerated cosmic expansion is problematic in that it seems to require an otherwise unobserved dark energy for its origin. A possible alternative explanation has been recently given, which attempts to account for this expansion in terms of a hypothesized matter-anti-matter repulsion. This repulsion or anti-gravity is derived by applying the CPT theorem to general relativity. We show that this proposal cannot work for two reasons: 1) it incorrectly predicts the behavior of photons and 2) the CPT transformation itself is not consistently applied.

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