Constraints on the CMB temperature-redshift dependence from SZ and distance measurements

• Published in: Journal of cosmology and astroparticle physics 2012-02, Vol.2012 (2), p.i-26
• Main Authors: Avgoustidis, A, Luzzi, G, Martins, C JAP, Monteiro, A MRVL
• Format: Article
• Language: English
• Subjects: Astrophysics; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; Constraining; COSMOLOGICAL CONSTANT; COSMOLOGICAL MODELS; COSMOLOGY; Cosmology and Extra-Galactic Astrophysics; Deviation; DISTANCE; DUALITY; High Energy Physics - Phenomenology; Law; PHOTONS; Physics; RED SHIFT; RELICT RADIATION; Sciences of the Universe; Searching; SPACE; State of the art; TEMPERATURE DEPENDENCE
• ISSN: 1475-7516; 1475-7508; 1475-7516
• DOI: 10.1088/1475-7516/2012/02/013

The relation between redshift and the CMB temperature, T sub(CMB)(z) = T sub(0)(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 ACDM 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 T sub(CMB)(z) = T sub(0)(1 + z) super(1- beta ) to be beta = 0.004 [+ or -] 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.