New Target for Cosmic Axion Searches.
Accepted version
Peer-reviewed
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Abstract
Future cosmic microwave background experiments have the potential to probe the density of relativistic species at the subpercent level. This sensitivity allows light thermal relics to be detected up to arbitrarily high decoupling temperatures. Conversely, the absence of a detection would require extra light species never to have been in equilibrium with the Standard Model. In this Letter, we exploit this feature to demonstrate the sensitivity of future cosmological observations to the couplings of axions to photons, gluons, and charged fermions. In many cases, the constraints achievable from cosmology will surpass existing bounds from laboratory experiments and astrophysical observations by orders of magnitude.
Description
Keywords
astro-ph.CO, astro-ph.CO, hep-ph, hep-th
Journal Title
Phys Rev Lett
Conference Name
Journal ISSN
0031-9007
1079-7114
1079-7114
Volume Title
117
Publisher
American Physical Society (APS)
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Sponsorship
Science and Technology Facilities Council (ST/J005673/1)
Science and Technology Facilities Council (ST/K00333X/1)
Science and Technology Facilities Council (ST/L000636/1)
Science and Technology Facilities Council (ST/M00418X/1)
Science and Technology Facilities Council (ST/M007065/1)
European Research Council (279617)
Science and Technology Facilities Council (ST/K00333X/1)
Science and Technology Facilities Council (ST/L000636/1)
Science and Technology Facilities Council (ST/M00418X/1)
Science and Technology Facilities Council (ST/M007065/1)
European Research Council (279617)
D.B. and B.W. acknowledge support from a Starting Grant of the European Research Council (ERC STG Grant 279617). B.W. is also supported by a Cambridge European Scholarship of the Cambridge Trust and an STFC Studentship. D.G. was supported by an NSERC Discovery Grant and the Canadian Institute for Advanced Research.