Gravitational birefringence and an exotic formula for redshift

Published 26 Feb 2018 in astro-ph.CO and gr-qc | (1802.09295v2)

Abstract: We compute the birefringence of light in curved Robertson-Walker spacetimes and propose an exotic formula for redshift based on the internal structure of the spinning photon. We then use the Hubble diagram of supernovae to test this formula.

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