2013/02/28 by Giuseppe Colucci, Armen Sedrakian · 6 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Equation of state #Gamma-ray bursts and supernovae #Hyperon #Lepton #Lepton number #Meson #Neutrino #Nuclear physics #Particle physics #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Scalar (mathematics) #astro-ph.HE #astro-ph.SR #nucl-th
paper · pdf · doi:10.1103/physrevc.87.055806
published as Phys. Rev. C 87, 055806 (2013) · v3: 11 pages, 8 figures, minor corrections, matches version published as an Editors' suggestion
arxiv created 2013/05/20 · openalex publication_date 2013/05/20 · arxiv updated 2013/05/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study the equation of state and composition of hypernuclear matter within a relativistic density functional theory with density-dependent couplings. The parameter space of hyperon--scalar-meson couplings is explored by allowing for mixing and breaking of SU(6) symmetry, while keeping the nucleonic coupling constants fixed. The subset of equations of state, which corresponds to small values of hyperon--scalar-meson couplings, allows for massive M\ensuremath≤2.25M_\ensuremath\bigodot compact stars; the radii of hypernuclear stars are within the range 12--14 km. We also study the equation of state of hot neutrino-rich and neutrinoless hypernuclear matter and confirm that neutrinos stiffen the equation of state and dramatically change the composition of matter by keeping the fractions of charged leptons nearly independent of the density prior to the onset of neutrino transparency. We provide piecewise polytropic fits to six representative equations of state of hypernuclear matter, which are suitable for applications in numerical astrophysics.