Birefringent light propagation on anisotropic cosmological backgrounds

Felipe A. Asenjo, Sergio A. Hojman

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


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 with 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 then dependent on light polarization, its dispersion, and its non-null geodesic behavior. New results presented here may help to tackle some issues related to the "horizon" problem.

Original languageEnglish
Article number046003
JournalPhysical Review D
Issue number4
StatePublished - 15 Aug 2017
Externally publishedYes


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