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Future cosmological sensitivity for hot dark matter axions

We study the potential of a future, large-volume photometric survey to constrain the axion mass $m_a$ in the hot dark matter limit. Future surveys such as Euclid will have significantly more constraining power than current observations for hot dark matter. Nonetheless, the lowest accessible axion ma...

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Detalles Bibliográficos
Autores principales: Archidiacono, Maria, Basse, Tobias, Hamann, Jan, Hannestad, Steen, Raffelt, Georg, Wong, Yvonne Y.Y.
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1475-7516/2015/05/050
http://cds.cern.ch/record/1989208
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author Archidiacono, Maria
Basse, Tobias
Hamann, Jan
Hannestad, Steen
Raffelt, Georg
Wong, Yvonne Y.Y.
author_facet Archidiacono, Maria
Basse, Tobias
Hamann, Jan
Hannestad, Steen
Raffelt, Georg
Wong, Yvonne Y.Y.
author_sort Archidiacono, Maria
collection CERN
description We study the potential of a future, large-volume photometric survey to constrain the axion mass $m_a$ in the hot dark matter limit. Future surveys such as Euclid will have significantly more constraining power than current observations for hot dark matter. Nonetheless, the lowest accessible axion masses are limited by the fact that axions lighter than $\sim 0.15$ eV decouple before the QCD epoch, assumed here to occur at a temperature $T_{\rm QCD} \sim 170$ MeV; this leaves an axion population of such low density that its late-time cosmological impact is negligible. For larger axion masses, $m_a \gtrsim 0.15$ eV, where axions remain in equilibrium until after the QCD phase transition, we find that a Euclid-like survey combined with Planck CMB data can detect $m_a$ at very high significance. Our conclusions are robust against assumptions about prior knowledge of the neutrino mass. Given that the proposed IAXO solar axion search is sensitive to $m_a\lesssim 0.2$ eV, the axion mass range probed by cosmology is nicely complementary.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2015
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spelling cern-19892082023-10-26T04:56:09Zdoi:10.1088/1475-7516/2015/05/050http://cds.cern.ch/record/1989208engArchidiacono, MariaBasse, TobiasHamann, JanHannestad, SteenRaffelt, GeorgWong, Yvonne Y.Y.Future cosmological sensitivity for hot dark matter axionsAstrophysics and AstronomyWe study the potential of a future, large-volume photometric survey to constrain the axion mass $m_a$ in the hot dark matter limit. Future surveys such as Euclid will have significantly more constraining power than current observations for hot dark matter. Nonetheless, the lowest accessible axion masses are limited by the fact that axions lighter than $\sim 0.15$ eV decouple before the QCD epoch, assumed here to occur at a temperature $T_{\rm QCD} \sim 170$ MeV; this leaves an axion population of such low density that its late-time cosmological impact is negligible. For larger axion masses, $m_a \gtrsim 0.15$ eV, where axions remain in equilibrium until after the QCD phase transition, we find that a Euclid-like survey combined with Planck CMB data can detect $m_a$ at very high significance. Our conclusions are robust against assumptions about prior knowledge of the neutrino mass. Given that the proposed IAXO solar axion search is sensitive to $m_a\lesssim 0.2$ eV, the axion mass range probed by cosmology is nicely complementary.We study the potential of a future, large-volume photometric survey to constrain the axion mass ma in the hot dark matter limit. Future surveys such as EUCLID will have significantly more constraining power than current observations for hot dark matter. Nonetheless, the lowest accessible axion masses are limited by the fact that axions lighter than ~ 0.15 eV decouple before the QCD epoch, assumed here to occur at a temperature T(QCD) ~ 170 MeV, this leaves an axion population of such low density that its late-time cosmological impact is negligible. For larger axion masses, ma gtrsim 0.15 eV, where axions remain in equilibrium until after the QCD phase transition, we find that a EUCLID-like survey combined with Planck CMB data can detect ma at very high significance. Our conclusions are robust against assumptions about prior knowledge of the neutrino mass. Given that the proposed IAXO solar axion search is sensitive to malesssim0.2 eV, the axion mass range probed by cosmology is nicely complementary.We study the potential of a future, large-volume photometric survey to constrain the axion mass $m_a$ in the hot dark matter limit. Future surveys such as Euclid will have significantly more constraining power than current observations for hot dark matter. Nonetheless, the lowest accessible axion masses are limited by the fact that axions lighter than $\sim 0.15$ eV decouple before the QCD epoch, assumed here to occur at a temperature $T_{\rm QCD} \sim 170$ MeV; this leaves an axion population of such low density that its late-time cosmological impact is negligible. For larger axion masses, $m_a \gtrsim 0.15$ eV, where axions remain in equilibrium until after the QCD phase transition, we find that a Euclid-like survey combined with Planck CMB data can detect $m_a$ at very high significance. Our conclusions are robust against assumptions about prior knowledge of the neutrino mass. Given that the proposed IAXO solar axion search is sensitive to $m_a\lesssim 0.2$ eV, the axion mass range probed by cosmology is nicely complementary.arXiv:1502.03325oai:cds.cern.ch:19892082015-02-11
spellingShingle Astrophysics and Astronomy
Archidiacono, Maria
Basse, Tobias
Hamann, Jan
Hannestad, Steen
Raffelt, Georg
Wong, Yvonne Y.Y.
Future cosmological sensitivity for hot dark matter axions
title Future cosmological sensitivity for hot dark matter axions
title_full Future cosmological sensitivity for hot dark matter axions
title_fullStr Future cosmological sensitivity for hot dark matter axions
title_full_unstemmed Future cosmological sensitivity for hot dark matter axions
title_short Future cosmological sensitivity for hot dark matter axions
title_sort future cosmological sensitivity for hot dark matter axions
topic Astrophysics and Astronomy
url https://dx.doi.org/10.1088/1475-7516/2015/05/050
http://cds.cern.ch/record/1989208
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AT bassetobias futurecosmologicalsensitivityforhotdarkmatteraxions
AT hamannjan futurecosmologicalsensitivityforhotdarkmatteraxions
AT hannestadsteen futurecosmologicalsensitivityforhotdarkmatteraxions
AT raffeltgeorg futurecosmologicalsensitivityforhotdarkmatteraxions
AT wongyvonneyy futurecosmologicalsensitivityforhotdarkmatteraxions