1301.1312 (George Ellis et al.)

The blackness of the cosmic microwave background spectrum as a probe of
the distance-duality relation    [PDF]

George Ellis, Robert Poltis, Jean-Philippe Uzan, Amanda Weltman

A violation of the reciprocity relation, which induces a violation of the distance duality relation, reflects itself in a change in the normalisation of the cosmic microwave spectrum in such a way that its spectrum is grey. We show that existing observational constraints imply that the reciprocity relation cannot be violated by more than 0.01% between decoupling and today. We compare this effect to other sources of violation of the distance duality relations which induce spectral distortion of the cosmic microwave background spectrum.

View original: http://arxiv.org/abs/1301.1312