Sub-percent constraints on cosmological temperature evolution
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 dis...
| Main Authors: | , , , |
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| Format: | Article |
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American Physical Society
2016
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| Online Access: | https://eprints.nottingham.ac.uk/34957/ |
| _version_ | 1848794970721353728 |
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| author | Avgoustidis, A. Genova-Santos, R.T . Luzzi, G. Martins, C.J.A.P. |
| author_facet | Avgoustidis, A. Genova-Santos, R.T . Luzzi, G. Martins, C.J.A.P. |
| author_sort | Avgoustidis, A. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| 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 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. |
| first_indexed | 2025-11-14T19:24:39Z |
| format | Article |
| id | nottingham-34957 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:24:39Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-349572020-05-04T17:37:13Z https://eprints.nottingham.ac.uk/34957/ Sub-percent constraints on cosmological temperature evolution Avgoustidis, A. Genova-Santos, R.T . Luzzi, G. Martins, C.J.A.P. 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. American Physical Society 2016-02-12 Article PeerReviewed Avgoustidis, A., Genova-Santos, R.T ., Luzzi, G. and Martins, C.J.A.P. (2016) Sub-percent constraints on cosmological temperature evolution. Physical Review D, 93 (4). 043521/1-043521/8. ISSN 1550-2368 http://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.043521 doi:10.1103/PhysRevD.93.043521 doi:10.1103/PhysRevD.93.043521 |
| spellingShingle | Avgoustidis, A. Genova-Santos, R.T . Luzzi, G. Martins, C.J.A.P. Sub-percent constraints on cosmological temperature evolution |
| title | Sub-percent constraints on cosmological temperature evolution |
| title_full | Sub-percent constraints on cosmological temperature evolution |
| title_fullStr | Sub-percent constraints on cosmological temperature evolution |
| title_full_unstemmed | Sub-percent constraints on cosmological temperature evolution |
| title_short | Sub-percent constraints on cosmological temperature evolution |
| title_sort | sub-percent constraints on cosmological temperature evolution |
| url | https://eprints.nottingham.ac.uk/34957/ https://eprints.nottingham.ac.uk/34957/ https://eprints.nottingham.ac.uk/34957/ |