Spacetime symmetries and varying scalars

Details Spacetime symmetries and varying scalars Spacetime symmetries and varying scalars

2005-08-29

arxiv.org/abs/gr-qc/0508122v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages; Prepared for 3rd Meeting on CPT and Lorentz Symmetry (CPT 04), Bloomington, Indiana, 4-7 Aug 2004

Scientific paper

This talk discusses the relation between spacetime-dependent scalars, such as couplings or fields, and the violation of Lorentz symmetry. A specific cosmological supergravity model demonstrates how scalar fields can acquire time-dependent expectation values. Within this cosmological background, excitations of these scalars are governed by a Lorentz-breaking dispersion relation. The model also contains couplings of the scalars to the electrodynamics sector leading to the time dependence of both the fine-structure parameter alpha and the theta angle. Through these couplings, the variation of the scalars is also associated with Lorentz- and CPT-violating effects in electromagnetism.

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