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Subpercent constraints on cosmological temperature evolution

A. Avgoustidis, G. Luzzi, C. J. A. P. Martins, R. T. Génova-Santos

The redshift dependence of the cosmic microwave background temperature is one of the key cosmological observables. In the standard cosmological model one has T(z)=T0(1+z), where T0 is the present-day temperature. Deviations from this behavior would imply the presence of new physics. Here we discuss how the combination of all currently available direct and indirect measurements of T(z) constrains the common phenomenological parametrization T(z)=T0(1+z)1−β, and obtain the first sub-percent constraint on the β parameter, specifically β=(7.6±8.0)×10−3 at the 68.3% confidence level.

Physical Review D
Volume 93, Issue 0435
2016 February

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia