Non-minimal coupling of photons and axions

Abstract

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.

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

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• Neutron Stars in f(R)-Gravity and Its Extension with a Scalar Axion Field
• Strong gravitational lensing of rotating regular black holes in non-minimally coupled Einstein-Yang-Mills theory
• New application of the Killing vector field formalism: Modified periodic potential and two-level profiles of the axionic dark matter distribution
• Extended axion electrodynamics: Anomalous dynamo-optical response induced by gravitational pp-waves
• Magneto-electro-statics of axionically active systems: Induced field restructuring in magnetic stars
• Thermodynamic Behavior of a 4D Nonminimal Maxwell-AdS Black Hole
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