Journal article
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 observed excess emission of soft X-rays from galaxy clusters, and may also contribute to the diffuse unresolved cosmic X-ray background. We list a number of correlated predictions of the scenario.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Accepted manuscript, pdf, 213.8KB, Terms of use)
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- Publisher copy:
- 10.1103/PhysRevLett.111.151301
Authors
- Publisher:
- American Physical Society
- Journal:
- Physical Review Letters More from this journal
- Volume:
- 111
- Pages:
- 151301
- Publication date:
- 2013-10-11
- DOI:
- EISSN:
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1079-7114
- ISSN:
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0031-9007
- Keywords:
- Pubs id:
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pubs:401114
- UUID:
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uuid:27f1b9c0-5e2b-40d9-ad43-425db70a26eb
- Local pid:
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pubs:401114
- Source identifiers:
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401114
- Deposit date:
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2013-11-17
Terms of use
- Copyright holder:
- American Physical Society
- Copyright date:
- 2013
- Notes:
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4 pages, 2 figures. References and figures updated; v3. matches
published version This is an
Accepted Manuscript of a journal article published by the American Physical Society in Physical Review Letters on 2013-10-11, available online: http://dx.doi.org/10.1103/PhysRevLett.111.151301
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