Constraints on the CMB temperatureredshift dependence from SZ and distance measurements
Abstract
The relation between redshift and the CMB temperature, T_{CMB}(z) = T_{0}(1+z) is a key prediction of standard cosmology, but is violated in many nonstandard 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 stateoftheart 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 temperatureredshift 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 T_{CMB}(z) = T_{0}(1+z)^{1β} to be β = 0.004±0.016 up to a redshift z ~ 3. We also discuss how, with the next generation of space and groundbased experiments, these constraints can be improved by more than one order of magnitude.
 Publication:

Journal of Cosmology and Astroparticle Physics
 Pub Date:
 February 2012
 DOI:
 10.1088/14757516/2012/02/013
 arXiv:
 arXiv:1112.1862
 Bibcode:
 2012JCAP...02..013A
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 27 pages, 11 figures