Possibility of s-wave pion condensates in neutron stars revisited
Ohnishi, A. · Jido, D. · Sekihara, T. · Tsubakihara, K.
Original · EN
We examine possibilities of pion condensation with zero momentum (s-wave condensation) in neutron stars by using the pion-nucleus optical potential U and the relativistic mean field (RMF) models. We use low-density phenomenological optical potentials parameterized to fit deeply bound pionic atoms or pion-nucleus elastic scatterings. Proton fraction (Yₚ) and electron chemical potential (muₑ) in neutron star matter are evaluated in RMF models. We find that the s-wave pion condensation hardly takes place in neutron stars and especially has no chance if hyperons appear in neutron star matter and/or b₁ parameter in U has density dependence.
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