Scale-Chiral Symmetry, Proton Mass and Sound Velocity in Compact-Star Matter

2016/11/30 by Paeng, Won-Gi, Rho, Mannque
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th)

paper · doi:10.48550/arxiv.1611.09975

Abstract

With a light dilaton σ and the light-quark vector mesons V=(ρ,ω) incorporated into an effective scale-invariant hidden local symmetric Lagrangian, scale-chiral symmetry -- hidden in QCD -- arises at a high density, n_1/2, as an "emergent" symmetry, a phenomenon absent in standard chiral perturbative approaches but highly relevant for massive compact stars. What takes place as the density increases beyond n_1/2∼ 2n₀ in compressed baryonic matter is (1) a topology change from skyrmions to half-skyrmions, (2) parity doubling in the nucleon structure, (3) the maximum neutron star mass M≃ 2.01 M_\odot and the radius R≃ 12.0 km and (4) the sound velocity v_s²/c²≃ 1/3 due to the "vector manifestation (VM)" fixed point of ρ and a "walking" dilaton condensate, which is intricately connected to the source of the proton mass.

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