Constraining hypernuclear density functional with Λ-hypernuclei and compact stars

2014/06/01 by E. N. E. van Dalen, Giuseppe Colucci, Armen Sedrakian · 107 citations
Physics and Astronomy · #Astrophysics #Baryon #Diquark #Gamma-ray bursts and supernovae #Hyperon #Isoscalar #Isovector #Meson #Nuclear physics #Nucleon #Octet #Particle physics #Physics #Pulsars and Gravitational Waves Research #Quantum Chromodynamics and Particle Interactions #Stars #astro-ph.SR #nucl-th

paper · pdf · open access · doi:10.1016/j.physletb.2014.06.002

published in Physics Letters B 734, 383-387 (Elsevier BV) · 10 pages, 4 figures, to appear in Phys. Lett. B, v2: minor editorial corrections

openalex publication_date 2014/06/01 · arxiv created 2014/06/06 · arxiv updated 2014/06/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present a simultaneous calculation of heavy single-Λ hypernuclei and compact stars containing hypernuclear core within a relativistic density functional theory based on a Lagrangian which includes the hyperon octet and lightest isoscalar-isovector mesons which couple to baryons with density-dependent couplings. The corresponding density functional allows for SU(6) symmetry breaking and mixing in the isoscalar sector, whereby the departures in the σ–Λ and σ–Σ couplings away from their values implied by the SU(3) symmetric model are used to adjust the theory to the laboratory and astronomical data. We fix σ–Λ coupling using the data on the single-Λ hypernuclei and derive an upper bound on the σ–Σ from the requirement that the lower bound on the maximum mass of a compact star is 2M⊙.

Citations

• The Octet Model and its Clebsch-Gordan Coefficients
• Neutron-skin thickness of ²⁰⁸Pb, and symmetry-energy constraints from the study of the anti-analog giant dipole resonance
• Equation of state of hypernuclear matter: Impact of hyperon–scalar-meson couplings
• The physics of dense hadronic matter and compact stars
• A two-solar-mass neutron star measured using Shapiro delay
• A Massive Pulsar in a Compact Relativistic Binary

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