Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe
The South Pole Telescope (SPT), Atacama Cosmology Telescope (ACT), and Wilkinson Microwave Anisotropy Probe (WMAP) have each reported measurements of the cosmic microwave background's (CMB) angular power spectrum which favor the existence of roughly one additional neutrino species, in addition...
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ftdatacite:10.48550/arxiv.1111.6599 2023-05-15T18:22:49+02:00 Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe Hooper, Dan Queiroz, Farinaldo S. Gnedin, Nickolay Y. 2011 https://dx.doi.org/10.48550/arxiv.1111.6599 https://arxiv.org/abs/1111.6599 unknown arXiv https://dx.doi.org/10.1103/physrevd.85.063513 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Cosmology and Nongalactic Astrophysics astro-ph.CO High Energy Astrophysical Phenomena astro-ph.HE High Energy Physics - Phenomenology hep-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2011 ftdatacite https://doi.org/10.48550/arxiv.1111.6599 https://doi.org/10.1103/physrevd.85.063513 2022-04-01T14:05:08Z The South Pole Telescope (SPT), Atacama Cosmology Telescope (ACT), and Wilkinson Microwave Anisotropy Probe (WMAP) have each reported measurements of the cosmic microwave background's (CMB) angular power spectrum which favor the existence of roughly one additional neutrino species, in addition to the three contained in the standard model of particle physics. Neutrinos influence the CMB by contributing to the radiation density, which alters the expansion rate of the universe during the epoch leading up to recombination. In this paper, we consider an alternative possibility that the excess kinetic energy implied by these measurements was possessed by dark matter particles that were produced through a non-thermal mechanism, such as late-time decays. In particular, we find that if a small fraction (<1%) of the dark matter in the universe today were produced through the decays of a heavy and relatively long-lived state, the expansion history of the universe can be indistinguishable from that predicted in the standard cosmological model with an additional neutrino. Furthermore, if these decays take place after the completion of big bang nucleosynthesis, this scenario can avoid tension with the value of three neutrino species preferred by measurements of the light element abundances. : 5 pages, 2 figures Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole Wilkinson ENVELOPE(-66.200,-66.200,-66.817,-66.817) |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
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language |
unknown |
topic |
Cosmology and Nongalactic Astrophysics astro-ph.CO High Energy Astrophysical Phenomena astro-ph.HE High Energy Physics - Phenomenology hep-ph FOS Physical sciences |
spellingShingle |
Cosmology and Nongalactic Astrophysics astro-ph.CO High Energy Astrophysical Phenomena astro-ph.HE High Energy Physics - Phenomenology hep-ph FOS Physical sciences Hooper, Dan Queiroz, Farinaldo S. Gnedin, Nickolay Y. Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe |
topic_facet |
Cosmology and Nongalactic Astrophysics astro-ph.CO High Energy Astrophysical Phenomena astro-ph.HE High Energy Physics - Phenomenology hep-ph FOS Physical sciences |
description |
The South Pole Telescope (SPT), Atacama Cosmology Telescope (ACT), and Wilkinson Microwave Anisotropy Probe (WMAP) have each reported measurements of the cosmic microwave background's (CMB) angular power spectrum which favor the existence of roughly one additional neutrino species, in addition to the three contained in the standard model of particle physics. Neutrinos influence the CMB by contributing to the radiation density, which alters the expansion rate of the universe during the epoch leading up to recombination. In this paper, we consider an alternative possibility that the excess kinetic energy implied by these measurements was possessed by dark matter particles that were produced through a non-thermal mechanism, such as late-time decays. In particular, we find that if a small fraction (<1%) of the dark matter in the universe today were produced through the decays of a heavy and relatively long-lived state, the expansion history of the universe can be indistinguishable from that predicted in the standard cosmological model with an additional neutrino. Furthermore, if these decays take place after the completion of big bang nucleosynthesis, this scenario can avoid tension with the value of three neutrino species preferred by measurements of the light element abundances. : 5 pages, 2 figures |
format |
Text |
author |
Hooper, Dan Queiroz, Farinaldo S. Gnedin, Nickolay Y. |
author_facet |
Hooper, Dan Queiroz, Farinaldo S. Gnedin, Nickolay Y. |
author_sort |
Hooper, Dan |
title |
Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe |
title_short |
Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe |
title_full |
Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe |
title_fullStr |
Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe |
title_full_unstemmed |
Non-Thermal Dark Matter Mimicking An Additional Neutrino Species In The Early Universe |
title_sort |
non-thermal dark matter mimicking an additional neutrino species in the early universe |
publisher |
arXiv |
publishDate |
2011 |
url |
https://dx.doi.org/10.48550/arxiv.1111.6599 https://arxiv.org/abs/1111.6599 |
long_lat |
ENVELOPE(-66.200,-66.200,-66.817,-66.817) |
geographic |
South Pole Wilkinson |
geographic_facet |
South Pole Wilkinson |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1103/physrevd.85.063513 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1111.6599 https://doi.org/10.1103/physrevd.85.063513 |
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1766202238896701440 |