Non-minimal coupling of photons and axions

Details Non-minimal coupling of photons and axions Non-minimal coupling of photons and axions

2009-11-16

arxiv.org/abs/0911.2946v2

Class. Quantum Grav. 27 (2010) 055003 (23pp)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

31 pages, 2 Tables; replaced with the final version published in Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/27/5/055003

We establish a new self-consistent system of equations accounting for a non-minimal interaction of gravitational, electromagnetic and axion fields. The procedure is based on a non-minimal extension of the standard Einstein-Maxwell-axion action. The general properties of a ten-parameter family of non-minimal linear models are discussed. We apply this theory to the models with pp-wave symmetry and consider propagation of electromagnetic waves non-minimally coupled to the gravitational and axion fields. We focus on exact solutions of electrodynamic equations, which describe quasi-minimal and non-minimal optical activity induced by the axion field. We also discuss empirical constraints on coupling parameters from astrophysical birefringence and polarization rotation observations.

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