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Production of thermal axions across the electroweak phase transition
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- Arias-Aragon, Fernando (author)
- Inst Fis Teor UAM CSIC, Calle Nicolas Cabrera 13-15, E-28049 Madrid, Spain.;Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain.
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- D'Eramo, Francesco (author)
- Univ Padua, Dipartimento Fis & Astron, Via Marzolo 8, I-35131 Padua, Italy.;Ist Nazl Fis Nucl, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy.
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- Ferreira, Ricardo Z. (author)
- Stockholms universitet,KTH,Nordic Institute for Theoretical Physics NORDITA,Stockholm Univ, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.;Inst Fis Altes Energies IFAE, Campus UAB, Barcelona 08193, Spain.;Barcelona Inst Sci & Technol BIST, Campus UAB, Barcelona 08193, Spain.,Nordiska institutet för teoretisk fysik (Nordita),The Barcelona Institute of Science and Technology (BIST), Spain
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- Inst Fis Teor UAM CSIC, Calle Nicolas Cabrera 13-15, E-28049 Madrid, Spain;Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain. Univ Padua, Dipartimento Fis & Astron, Via Marzolo 8, I-35131 Padua, Italy.;Ist Nazl Fis Nucl, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy. (creator_code:org_t)
- 2021-03-26
- 2021
- English.
- In: Journal of Cosmology and Astroparticle Physics. - : IOP Publishing. - 1475-7516. ; :3
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Light axions can potentially leave a cosmic background, just like neutrinos. We complete the study of thermal axion production across the electroweak scale by providing a smooth and continuous treatment through the two phases. Focusing on both flavor conserving and violating couplings to third generation quarks, we compute the amount of axions produced via scatterings and decays of thermal bath particles. We perform a model independent analysis in terms of axion effective couplings, and we also make predictions for specific microscopic QCD axion scenarios. This observable effect, parameterized as it is conventional by an effective number of additional neutrinos, is above the 1 sigma sensitivity of future CMB-S4 surveys. Moreover, if one assumes no large hierarchies among dimensionless axion couplings to standard model particles, future axion helioscopes will provide a complementary probe for the parameter region we study.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- axions
- cosmology of theories beyond the SM
- particle physics - cosmology connection
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- art (subject category)
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