Axion-pion thermalization rate in unitarized NLO chiral perturbation theory

Bibcode
2023PhRvD.108c5025D
DOI
10.1103/PhysRevD.108.035025
Di Luzio, Luca; Martin Camalich, Jorge; Martinelli, Guido; Oller, José Antonio; Piazza, Gioacchino
Bibliographical reference

Physical Review D

Advertised on:
8
2023
Journal
Physical Review D
Number of authors
5
IAC number of authors
1
Citations
17
Refereed citations
14
Description
We compute the axion-pion scattering a π →π π , relevant for the axion thermalization rate in the early Universe, within unitarized next-to-leading-order chiral perturbation theory. The latter extends the range of validity of the chiral expansion of axion-pion scattering and thus provides a crucial ingredient for the reliable determination of the relic density of thermal axions, whenever the axion decoupling temperature is below that of the QCD phase transition. Implications for cosmological observables are briefly discussed.
Type
Refereed

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