Shining ALP dark radiation
String scenarios typically not only predict axionlike particles (ALPs) but also significant amounts of ALP dark radiation originating from the decay of the inflaton or a more general modulus. In this paper, we study the decay of such nonthermally produced relativistic (but massive) ALPs to photons....
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2 June 2022
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| In: |
Physical review
Year: 2022, Volume: 105, Issue: 11, Pages: 1-13 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.105.115003 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.105.115003 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.105.115003 
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| Author Notes: | Joerg Jaeckel and Wen Yin |
| Summary: | String scenarios typically not only predict axionlike particles (ALPs) but also significant amounts of ALP dark radiation originating from the decay of the inflaton or a more general modulus. In this paper, we study the decay of such nonthermally produced relativistic (but massive) ALPs to photons. If the ALPs are sufficiently highly energetic, contribute to ΔNeff≳O(0.001), and have a mass ma≳MeV we find that, using observations of x-, and γ-rays, the CMB and BBN, very small values of the ALP-photon coupling, can be probed, corresponding to an origin of this coupling at the string (or even Planck) scale. |
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| Item Description: | Gesehen am 27.07.2022 |
| Physical Description: | Online Resource |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.105.115003 |