| Article | |
| Report number | arXiv:2211.03799 ; CERN-TH-2022-165 |
| Title | Improved hot dark matter bound on the QCD axion |
| Author(s) | Notari, Alessio (Barcelona U. ; INFN, Florence) ; Rompineve, Fabrizio (CERN) ; Villadoro, Giovanni (ICTP, Trieste) |
| Publication | 2023-07-07 |
| Imprint | 2022-11-07 |
| Number of pages | 8 |
| Note | 6+8 pages, 7 figures |
| In: | Phys. Rev. Lett. 131 (2023) 011004 |
| DOI | 10.1103/PhysRevLett.131.011004 (publication) |
| Subject category | astro-ph.CO ; Astrophysics and Astronomy ; hep-ph ; Particle Physics - Phenomenology |
| Abstract | We strengthen the cosmological bound on the axion mass, by solving the momentum-dependent Boltzmann equations for axion-pion scatterings and by using a phenomenological production rate derived from pion-pion scattering data, overcoming the breakdown of chiral perturbation theory. Using present cosmological datasets we obtain $m_a\leq 0.24 \text{eV}$. To further improve the bound and exploit the reach of upcoming cosmological surveys, reliable non-perturbative calculations above the QCD crossover are needed. |
| Copyright/License | preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2023-2025 authors (License: CC BY 4.0), sponsored by SCOAP³ |
Corresponding record in: Inspire
Registre creat el 2022-11-10, darrera modificació el 2024-09-05
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