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Searching for a 0.1-1 keV Cosmic Axion Background

Abstract:

Primordial decays of string theory moduli at z \sim 10^{12} naturally generate a dark radiation Cosmic Axion Background (CAB) with 0.1 - 1 keV energies. This CAB can be detected through axion-photon conversion in astrophysical magnetic fields to give quasi-thermal excesses in the extreme ultraviolet and soft X-ray bands. Substantial and observable luminosities may be generated even for axion-photon couplings \ll 10^{-11} GeV^{-1}. We propose that axion-photon conversion may explain the observ...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Accepted manuscript

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Publisher copy:
10.1103/PhysRevLett.111.151301

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Theoretical Physics
Marsh, MCD More by this author
Publisher:
American Physical Society Publisher's website
Journal:
Physical Review Letters Journal website
Volume:
111
Pages:
151301
Publication date:
2013-10-11
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:27f1b9c0-5e2b-40d9-ad43-425db70a26eb
Source identifiers:
401114
Local pid:
pubs:401114

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