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Pion stars embedded in neutrino clouds

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arxiv 2303.06190 v1 pith:3X47SQOI submitted 2023-03-10 hep-ph gr-qc

Pion stars embedded in neutrino clouds

classification hep-ph gr-qc
keywords pionstarscloudsmodelneutrinophenomenologicalstateanalyze
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study self-gravitating multi-pion systems (pion stars) in a state of the Bose condensate. To ensure stability of such stars, it is assumed that they are immersed in the lepton background. Two different phenomenological equations of state (EoS) for the pion matter are used, some of them having the first order phase transition. The model parameters are chosen to reproduce the recent lattice QCD data at zero temperature and large isospin chemical potential. It is shown that the mass-radius diagrams of pion stars obtained with phenomenological EoS are close to ones calculated in the ideal gas model. We analyze properties of neutrino clouds which are necessary for stabilizing the pion stars.

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  1. Minimal superfluid vortices in chiral perturbation theory

    hep-ph 2026-06 unverdicted novelty 4.0

    Leading order chiral perturbation theory yields the minimal energy condition for vortex nucleation in the pion condensed phase, with vortices carrying quantized angular momentum and self-confining pions.