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Light axion-like dark matter must be present during inflation
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Helsinki, Finland.
Number of Authors: 1
2017 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 96, no 2, 023013Article in journal (Refereed) Published
Abstract [en]

Axion-like particles (ALPs) might constitute the totality of the cold dark matter (CDM) observed. The parameter space of ALPs depends on the mass of the particle In and on the energy scale of inflation Hi, the latter being hound by the nondetection of primordial gravitational waves. We show that the hound on H-I implies the existence of a mass scale (m) over bar (chi) = 10 neV-0.5 peV, depending on the ALP susceptibility 7, such that the energy density of ALPs of mass smaller than (m) over bar (chi) is too low to explain the present CDIVI. budget, if the ALP field has originated after the end of inflation. This bound affects ultra-light axions (ULAs), which have recently regained popularity as CDM candidates. Light On (m < m(chi)) ALPs can then be CDM candidates only if the ALP field has already originated during the inflationary period, in which case the parameter space is constrained by the nondetection of axion isocurvature fluctuations. We comment on the effects on these bounds from additional physics beyond the standard model, besides ALPs.

Place, publisher, year, edition, pages
2017. Vol. 96, no 2, 023013
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-145881DOI: 10.1103/PhysRevD.96.023013ISI: 000406548100001OAI: oai:DiVA.org:su-145881DiVA: diva2:1135090
Available from: 2017-08-22 Created: 2017-08-22 Last updated: 2017-08-22Bibliographically approved

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Visinelli, Luca
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Nordic Institute for Theoretical Physics (Nordita)
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