Neutrino interactions in the late universe

Abstract The cosmic neutrino background is both a dramatic prediction of the hot Big Bang and a compelling target for current and future observations. The impact of relativistic neutrinos in the early universe has been observed at high significance in a number of cosmological probes. In addition, th...

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Autores principales:	Daniel Green, David E. Kaplan, Surjeet Rajendran
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Beyond Standard Model Neutrino Physics Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/4f25b469c3ee4448a044fc492f3d572c
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spelling	oai:doaj.org-article:4f25b469c3ee4448a044fc492f3d572c2021-11-28T12:39:33ZNeutrino interactions in the late universe10.1007/JHEP11(2021)1621029-8479https://doaj.org/article/4f25b469c3ee4448a044fc492f3d572c2021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)162https://doaj.org/toc/1029-8479Abstract The cosmic neutrino background is both a dramatic prediction of the hot Big Bang and a compelling target for current and future observations. The impact of relativistic neutrinos in the early universe has been observed at high significance in a number of cosmological probes. In addition, the non-zero mass of neutrinos alters the growth of structure at late times, and this signature is a target for a number of upcoming surveys. These measurements are sensitive to the physics of the neutrino and could be used to probe physics beyond the standard model in the neutrino sector. We explore an intriguing possibility where light right-handed neutrinos are coupled to all, or a fraction of, the dark matter through a mediator. In a wide range of parameter space, this interaction only becomes important at late times and is uniquely probed by late-time cosmological observables. Due to this coupling, the dark matter and neutrinos behave as a single fluid with a non-trivial sound speed, leading to a suppression of power on small scales. In current and near-term cosmological surveys, this signature is equivalent to an increase in the sum of the neutrino masses. Given current limits, we show that at most 0.5% of the dark matter could be coupled to neutrinos in this way.Daniel GreenDavid E. KaplanSurjeet RajendranSpringerOpenarticleBeyond Standard ModelNeutrino PhysicsNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-22 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Beyond Standard Model Neutrino Physics Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Beyond Standard Model Neutrino Physics Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Daniel Green David E. Kaplan Surjeet Rajendran Neutrino interactions in the late universe
description	Abstract The cosmic neutrino background is both a dramatic prediction of the hot Big Bang and a compelling target for current and future observations. The impact of relativistic neutrinos in the early universe has been observed at high significance in a number of cosmological probes. In addition, the non-zero mass of neutrinos alters the growth of structure at late times, and this signature is a target for a number of upcoming surveys. These measurements are sensitive to the physics of the neutrino and could be used to probe physics beyond the standard model in the neutrino sector. We explore an intriguing possibility where light right-handed neutrinos are coupled to all, or a fraction of, the dark matter through a mediator. In a wide range of parameter space, this interaction only becomes important at late times and is uniquely probed by late-time cosmological observables. Due to this coupling, the dark matter and neutrinos behave as a single fluid with a non-trivial sound speed, leading to a suppression of power on small scales. In current and near-term cosmological surveys, this signature is equivalent to an increase in the sum of the neutrino masses. Given current limits, we show that at most 0.5% of the dark matter could be coupled to neutrinos in this way.
format	article
author	Daniel Green David E. Kaplan Surjeet Rajendran
author_facet	Daniel Green David E. Kaplan Surjeet Rajendran
author_sort	Daniel Green
title	Neutrino interactions in the late universe
title_short	Neutrino interactions in the late universe
title_full	Neutrino interactions in the late universe
title_fullStr	Neutrino interactions in the late universe
title_full_unstemmed	Neutrino interactions in the late universe
title_sort	neutrino interactions in the late universe
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/4f25b469c3ee4448a044fc492f3d572c
work_keys_str_mv	AT danielgreen neutrinointeractionsinthelateuniverse AT davidekaplan neutrinointeractionsinthelateuniverse AT surjeetrajendran neutrinointeractionsinthelateuniverse
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Neutrino interactions in the late universe

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