Revisiting signatures of thermal axions in nonstandard cosmologies

Paola Arias (Departamento de Física, Universidad de Santiago de Chile Casilla 307, Santiago, Chile; Universidad San Sebastián, Santiago, Chile) ; Nicolás Bernal (New York University Abu Dhabi PO Box 129188, Saadiyat Island, Abu Dhabi, United Arab Emirates) ; Jacek K. Osiński (AstroCeNT, Nicolaus Copernicus Astronomical Center Polish Academy of Sciences ul. Rektorska 4, 00-614 Warsaw, Poland) ; Leszek Roszkowski (National Centre for Nuclear Research ul. Pasteura 7, 02-093 Warsaw, Poland; AstroCeNT, Nicolaus Copernicus Astronomical Center Polish Academy of Sciences ul. Rektorska 4, 00-614 Warsaw, Poland) ; Moira Venegas (Departamento de Física, Universidad de Santiago de Chile Casilla 307, Santiago, Chile; Department of Physics and Astronomy, Rice University Houston, Texas 77005, USA)

We revisit the formation of a thermal population of hadronic axions in nonstandard cosmologies, in light of the recent developments in obtaining continuous and smooth interaction rates for both the gluon and photon couplings. For certain cosmological histories, such as low-temperature reheating (LTR) and kinationlike scenarios, the thermalization of the axion can be severely delayed to higher masses. In the case that thermal equilibrium is achieved, we improve the constraints on LTR for axion masses around the eV scale with respect to previous works and we constrain for the first time early matter-dominated cosmologies. We also point out the possibility of having the coexistence of cold and warm dark matter populations of axions in kinationlike scenarios in the eV mass range.

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Published on:
14 June 2024
Publisher:
APS
Published in:
Physical Review D , Volume 109 (2024)
Issue 12
DOI:
https://doi.org/10.1103/PhysRevD.109.123529
arXiv:
2308.01352
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: