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Title: Thermal axion production

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.
Authors:
 [1] ;  [2] ;  [3]
  1. Departamento de Física Teórica, Universidad Autónoma de Madrid and Instituto de Física Teórica IFT-UAM/CSIC, Cantoblanco, Madrid, 28049 (Spain)
  2. Dipartimento di Fisica dell'Università di Pisa and INFN (Italy)
  3. INFN, Sezione di Trieste, SISSA, via Bonomea 265, Trieste, 34136 (Italy)
Publication Date:
OSTI Identifier:
22369821
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 01; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AXIONS; CALCULATION METHODS; GLUONS; STANDARD MODEL; TEMPERATURE DEPENDENCE; UNIVERSE; YUKAWA POTENTIAL