期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2019/10/016
关键词
axions; core-collapse supernovas; supernova neutrinos
资金
- Italian Istituto Nazionale di Fisica Nucleare (INFN) through the Theoretical Astroparticle Physics project
- Ministero dell'Istruzione, Universita e Ricerca (MIUR)
- COST (European Cooperation in Science and Technology) [CA16117]
- Polish National Science Center (NCN) [UMO-2016/23/B/ST2/00720]
- German Research Foundation (DFG, German Research Foundation) [279384907 - SFB 1245]
The most efficient axion production mechanism in a supernova (SN) core is the nucleon-nucleon bremsstrahlung. This process has been often modeled at the level of the vacuum one-pion exchange (OPE) approximation. Starting from this naive recipe, we revise the calculation including systematically different effects, namely a non-vanishing mass for the exchanged pion, the contribution from the two-pions exchange, effective in-medium nucleon masses and multiple nucleon scatterings. Moreover, we allow for an arbitrary degree of nucleon degeneracy. A self consistent treatment of the axion emission rate including all these effects is currently missing. The aim of this work is to provide such an analysis. Furthermore, we demonstrate that the OPE potential with all the previous corrections gives rise to similar results as the on-shell T-matrix, and is therefore well justified for our and similar studies. We find that the axion emissivity is reduced by over an order of magnitude with respect to the basic OPE calculation, after all these effects are accounted for. The implications for the axion mass bound and the impact for the next generation experimental axion searches is also discussed.
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