Radiative transfer in stars by feebly interacting bosons

Journal Article · 23 August 2022 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2022/08/045 · OSTI ID:1979367

Caputo, Andrea ^[1]; Raffelt, Georg ^[2]; Vitagliano, Edoardo ^[3]

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1. Tel Aviv University, Tel Aviv (Israel); Weizmann Institute of Science, Rehovot (Israel); Univ. of California, Los Angeles, CA (United States)
2. Max-Planck-Institut für Physik , Munich (Germany)
3. University of California, Los Angeles, CA (United States); University of Copenhagen (Denmark). The Niels Bohr Institute

Starting from first principles, we study radiative transfer by new feebly-interacting bosons (FIBs) such as axions, axion-like particles (ALPs), dark photons, and others. Our key simplification is to include only boson emission or absorption (including decay), but not scattering between different modes of the radiation field. Based on a given distribution of temperature and FIB absorption rate in a star, we derive explicit volume-integral expressions for the boson luminosity, reaching from the free-streaming to the strong-trapping limit. The latter is seen explicitly to correspond to quasi-thermal emission from a “FIB sphere” according to the Stefan-Boltzmann law. Our results supersede expressions and approximations found in the recent literature on FIB emission from a supernova core and, for radiatively unstable FIBs, provide explicit expressions for the nonlocal (“ballistic”) transfer of energy recently discussed in horizontal-branch stars.

• Research Organization: University of California, Los Angeles, CA (United States)
• Sponsoring Organization: Carlsberg Foundation; European Research Council (ERC); German Research Foundation (DFG); German-Israeli GIF; Israel Academy of Sciences and Humanities; Israel Science Foundation; Rosenfeld Foundation; US-Israeli BSF; USDOE Office of Science (SC); USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: SC0009937
• OSTI ID: 1979367
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2022; ISSN 1475-7516
• Publisher: Institute of Physics (IOP)Copyright Statement
• Country of Publication: United States
• Language: English