Pions in hot dense matter and their astrophysical implications

Fore, Bryce; Reddy, Sanjay

doi:10.1103/physrevc.101.035809

Title: Pions in hot dense matter and their astrophysical implications

Journal Article · Tue Mar 31 00:00:00 EDT 2020 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.101.035809· OSTI ID:1799998

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Univ. of Washington, Seattle, WA (United States)

Here we study the role of pions in hot dense matter encountered in astrophysics. We find that strong interactions enhance the number density of negatively charged pions and that this enhancement can be calculated reliably for a relevant range of density and temperature by using the virial expansion. We assess the influence of pions and muons on the equation of state (EOS) and weak-interaction rates in hot dense matter. We find that thermal pions increase the proton fraction and soften the EOS. We also find that charged current weak reactions involving pions and muons $$\bar{ν}_ μ + μ^– → π$$ and $$ν_μ + π^– → μ^–$$ make an important contribution to the opacity of muon neutrinos. This could influence the dynamics of core-collapse supernovae and neutron-star mergers. Finally, we note that pion-nucleon reactions can alter the evolution of the proton fraction when weak interactions are not in equilibrium.

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Research Organization:: Univ. of Washington, Seattle, WA (United States); Univ. of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); National Science Foundation (NSF)

Grant/Contract Number:: FG02-00ER41132; SC0018232; A18-0354-S002; DGE-1762114; FG02- 00ER41132

OSTI ID:: 1799998

Alternate ID(s):: OSTI ID: 1607817

Journal Information:: Physical Review. C, Vol. 101, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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