Subpercent constraints on the cosmological temperature evolution

Bibcode
2016PhRvD..93d3521A
DOI
10.1103/PhysRevD.93.043521
Avgoustidis, A.; Génova-Santos, R. T.; Luzzi, G.; Martins, C. J. A. P.
Bibliographical reference

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

Advertised on:
2
2016
Journal
Physical Review D
Number of authors
4
IAC number of authors
1
Citations
28
Refereed citations
25
Description
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.
Type
Refereed

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