Thermal axion production

By A. Salvio, Alessandro Strumia, W. Xue. 2013

181 citations recorded by the source corpus.

We reconsider thermal production of axions in the early universe, including axion couplings to all Standard Model (SM>) particles. Concerning the axion coupling to gluons, we find that thermal effects enhance the axion production rate by a factor of few with respect to previous computations performed in the limit of small strong gauge coupling. Furthermore, we find that the top Yukawa coupling induces a much larger axion production rate, unless the axion couples to SM particles only via anomalies.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b4471a6f6d327ebcfdb1a1373959a6bde9c349df

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Physics potential of the International Axion Observatory (IAXO) (2019, background): “Moreover, the efficiency of the thermal production is enhanced by about 3 orders of magnitude if there is a direct coupling between axion and top quarks [148], and so in this case the required TRH goes down by the same amount.”
Hot axions and the H0 tension (2018, background): “On the contrary, production via gauge boson scattering is peaked at high temperatures [23, 24, 26] and it is a subdominant contribution at the QCDPT.”
The landscape of QCD axion models (2020, background): “In models where a direct coupling between axion and top quarks exists, the efficiency of the thermal production is enhanced by up to three orders of magnitude [316].”
New experimental approaches in the search for axion-like particles (2018, background): “The relation between ALP couplings and the decoupling temperature has been worked out for photons [287, 288], pions [289, 290], gluons [291, 292], leptons and quarks [293, 294], see [283, 294] for a recent reassessment.”
The QCD axion, precisely (2015, background): “For Axion could also be produced thermally in the early universe, this population would be sub-dominant for the allowed values of fa [68–71] but might leave a trace as dark radiation.”
CMB-S4 Science Case, Reference Design, and Project Plan (2019, background): “New light particles may arise in the form of axions and sterile neutrinos, or can appear as a byproduct of new symmteries that would explain the small mass of the Higgs boson [142, 143, 144, 145, 146, 147, 148, 10, 149, 150, 151, 152, 11, 153, 154, 141, 155, 12, 156, 157, 158, 159].”
Dark photon dark matter produced by axion oscillations (2018, unknown): “[46] A.”
Light dark matter: Models and constraints (2017, background): “Reference [143] found a pseudoscalar production rate of”