Subpercent constraints on the cosmological temperature evolution

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

Physical Review D, Volume 93, Issue 4, id.043521

Fecha de publicación:
2
2016
Número de autores
4
Número de autores del IAC
1
Número de citas
26
Número de citas referidas
23
Descripción
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 subpercent constraint on the temperature growth index 1 -β . Specifically, we find β =(7.6 ±8.0 )×10-3 at the 68.3% confidence level.