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

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