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New Target for Cosmic Axion Searches. | LitMetric

New Target for Cosmic Axion Searches.

Phys Rev Lett

DAMTP, University of Cambridge, Cambridge, CB3 0WA, United Kingdom.

Published: October 2016

AI Article Synopsis

Article 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.

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Source
http://dx.doi.org/10.1103/PhysRevLett.117.171301DOI Listing

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