Shining ALP dark radiation

• Verfasst von: Jaeckel, Joerg [VerfasserIn]
• Verfasst von: Yin, Wen [VerfasserIn]
• Titel: Shining ALP dark radiation
• Verf.angabe: Joerg Jaeckel and Wen Yin
• E-Jahr: 2022
• Jahr: 2 June 2022
• Umfang: 13 S.
• Fussnoten: Gesehen am 27.07.2022
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2022
• Band/Heft Quelle: 105(2022), 11, Artikel-ID 115003, Seite 1-13
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.105.115003
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1811798659

Abstract

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.