Birefringent light propagation on anisotropic cosmological backgrounds

Abstract

Exact electromagnetic wave solutions to Maxwell equations on anisotropic Bianchi I cosmological spacetime backgrounds are studied. The waves evolving on Bianchi I spacetimes exhibit birefringence (associated to linear polarization) and dispersion. The particular case of a vacuum--dominated anisotropic Universe, which reproduces a Friedmann-Robertson-Walker Universe (for late times) while for earlier times it matches a Kasner Universe, is studied. The electromagnetic waves do not, in general, follow null geodesics. This produces a modification of the cosmological redshift, which is now dependent on light polarization and dispersion and its non-null geodesic behavior. New results presented here may help to tackle some issues related to the "horizon" problem.

Accepted in Physical Review D

References in corpus (4)

• Electromagnetic duality anomaly in curved spacetimes
• The critical geometry of a thermal big bang
• Extending geometrical optics: A Lagrangian theory for vector waves
• On the Possibility of Non-Geodesic Motion of the Massless Spinning Top

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