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Backscattering Caused by the Expansion of the Universe
Phys. Rev. D 5, 2905 – Published 15 June, 1972
DOI: https://doi.org/10.1103/PhysRevD.5.2905
Abstract
We show that in a Robertson-Walker space-time, expansion-induced backscattering of electromagnetic waves is rigorously absent, contrary to earlier expectations. The absence of backscattering is a direct consequence of the conformal invariance of the equations of motion, and therefore extends to neutrinos and gravitational waves. Any non-null observation of back-scattering caused by the expansion would indicate that there exists expansion anisotropy.
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