CPT symmetry and antimatter gravity in general relativity

Details CPT symmetry and antimatter gravity in general relativity CPT symmetry and antimatter gravity in general relativity

2011-03-25

arxiv.org/abs/1103.4937v1

EPL (Europhysics Letters) 94 (2011) 20001

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages, to be published in EPL (http://epljournal.edpsciences.org/)

Scientific paper

10.1209/0295-5075/94/20001

The gravitational behavior of antimatter is still unknown. While we may be confident that antimatter is self-attractive, the interaction between matter and antimatter might be either attractive or repulsive. We investigate this issue on theoretical grounds. Starting from the CPT invariance of physical laws, we transform matter into antimatter in the equations of both electrodynamics and gravitation. In the former case, the result is the well-known change of sign of the electric charge. In the latter, we find that the gravitational interaction between matter and antimatter is a mutual repulsion, i.e. antigravity appears as a prediction of general relativity when CPT is applied. This result supports cosmological models attempting to explain the Universe accelerated expansion in terms of a matter-antimatter repulsive interaction.

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