Sub-percent constraints on cosmological temperature evolution

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

Abstract

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 temperature growth index 1 − β. Specifically, we find β = (7.6 ± 8.0) × 10^(−3) at the 68.3% confidence level.

Citation

Avgoustidis, A., Genova-Santos, R. .., Luzzi, G., & Martins, C. (2016). Sub-percent constraints on cosmological temperature evolution. Physical Review D - Particles, Fields, Gravitation and Cosmology, 93(4), Article 043521. https://doi.org/10.1103/PhysRevD.93.043521

• Journal Article Type: Article
• Acceptance Date: Jan 22, 2016
• Publication Date: Feb 12, 2016
• Deposit Date: Jul 14, 2016
• Publicly Available Date: Jul 14, 2016
• Journal: Physical Review D
• Print ISSN: 1550-7998
• Electronic ISSN: 1550-2368
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 93
• Issue: 4
• Article Number: 043521
• DOI: https://doi.org/10.1103/PhysRevD.93.043521
• Public URL: https://nottingham-repository.worktribe.com/output/776407
• Publisher URL: http://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.043521