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

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arxiv 1301.1312 v2 pith:DC67HNOI submitted 2013-01-07 astro-ph.CO gr-qc

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

George F.R. Ellis , Robert Poltis , Jean-Philippe Uzan , Amanda Weltman This is my paper
classification astro-ph.CO gr-qc
keywords relationspectrumcosmicmicrowaveviolationbackgrounddistanceduality
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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.

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  1. Can Distance Duality Violation Save Late-time Solutions to the Hubble Tension?

    astro-ph.CO 2026-07 accept novelty 6.0

    For fixed sound-horizon and supernova calibrations, no late-time modification—even one violating cosmic distance duality—can resolve the Hubble tension, because the required ~8-10% CDDR violation is excluded by BAO, c...