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Gravitational birefringence of light in Robertson-Walker cosmologies

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arxiv 1610.00555 v3 pith:BTGNWVDJ submitted 2016-10-03 gr-qc astro-ph.COhep-thphysics.optics

Gravitational birefringence of light in Robertson-Walker cosmologies

classification gr-qc astro-ph.COhep-thphysics.optics
keywords casedeviationequationsrobertson-walkersystemaccelerationbackgroundbirefringence
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The spacetime evolution of massless spinning particles in a Robertson-Walker background is derived using the deterministic system of equations of motion due to Papapetrou, Souriau and Saturnini. A numerical integration of this system of differential equations in the case of the standard model of cosmology is performed. The deviation of the photon worldlines from the null geodesics is of the order of the wavelength. Perturbative solutions are also worked out in a more general case. An experimental measurement of this deviation would test the acceleration of our expanding universe.

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