2014/12/31 by Matthias Drews, Wolfram Weise · 61 citations
Physics and Astronomy · #Functional renormalization group #Isospin #Mathematical physics #Mean field theory #Neutron #Neutron star #Nuclear matter #Nuclear physics #Nucleon #Particle physics #Physics #Pion #Pulsars and Gravitational Waves Research #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #Quantum, superfluid, helium dynamics #Renormalization group #Strange matter #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevc.91.035802
published in Physical Review C 91(3) (American Institute of Physics) · 12 pages, 11 figures, to appear in Phys. Rev. C, references added, figure 5 added
arxiv created 2015/02/22 · openalex publication_date 2015/03/17 · arxiv updated 2015/06/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A previous study of nuclear matter in a chiral nucleon-meson model is extended to isospin-asymmetric matter. Fluctuations beyond mean-field approximation are treated in the framework of the functional renormalization group. The nuclear liquid-gas phase transition is investigated in detail as a function of the proton fraction in asymmetric matter. The equations of state at zero temperature of both symmetric nuclear matter and pure neutron matter are found to be in good agreement with realistic many-body computations. We also study the density dependence of the pion mass in the medium. The question of chiral symmetry restoration in neutron matter is addressed; we find a stabilization of the phase with spontaneously broken chiral symmetry once fluctuations are included. Finally, neutron-star matter including \ensuremathβ equilibrium is discussed. The model satisfies the constraints imposed by the existence of two-solar mass neutron stars.