Spacetime symmetries and varying scalars
Abstract
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.
Cite
@article{arxiv.gr-qc/0508122,
title = {Spacetime symmetries and varying scalars},
author = {Ralf Lehnert},
journal= {arXiv preprint arXiv:gr-qc/0508122},
year = {2016}
}
Comments
11 pages; Prepared for 3rd Meeting on CPT and Lorentz Symmetry (CPT 04), Bloomington, Indiana, 4-7 Aug 2004