2011/12/08 by A. Avgoustidis, A Avgoustidis, G. Luzzi +5 · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Particle physics theoretical and experimental studies #astro-ph.CO #hep-ph
paper · pdf · doi:10.1088/1475-7516/2012/02/013
27 pages, 11 figures
arxiv created 2011/12/08 · openalex publication_date 2012/02/14 · arxiv updated 2015/06/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/02
The relation between redshift and the CMB temperature, TCMB(z)=T0(1+z) is a key prediction of standard cosmology, but is violated in many non-standard models. Constraining possible deviations to this law is an effective way to test the ΛCDM paradigm and search for hints of new physics. We present state-of-the-art constraints, using both direct and indirect measurements. In particular, we point out that in models where photons can be created or destroyed, not only does the temperature-redshift relation change, but so does the distance duality relation, and these departures from the standard behaviour are related, providing us with an opportunity to improve constraints. We show that current datasets limit possible deviations of the form TCMB(z)=T0(1+z)1-β to be β=0.004±0.016 up to a redshift z∼ 3. We also discuss how, with the next generation of space and ground-based experiments, these constraints can be improved by more than one order of magnitude.