Application of density dependent parametrization models to asymmetric nuclear matter

Abstract

Density dependent parametrization models of the nucleon-meson effective couplings, including the isovector scalar δ-field, are applied to asymmetric nuclear matter. The nuclear equation of state and the neutron star properties are studied in an effective Lagrangian density approach, using the relativistic mean field hadron theory. It is known that the introduction of a δ-meson in the constant coupling scheme leads to an increase of the symmetry energy at high density and so to larger neutron star masses, in a pure nucleon-lepton scheme. We use here a more microscopic density dependent model of the nucleon-meson couplings to study the properties of neutron star matter and to re-examine the δ-field effects in asymmetric nuclear matter. Our calculations show that, due to the increase of the effective δcoupling at high density, with density dependent couplings the neutron star masses in fact can be even reduced.

5 pages, 4 figures

References in corpus (24)

• Determination of the Equation of State of Dense Matter
• The Physics of Neutron Stars
• Reaction Dynamics with Exotic Beams
• Constraints on the high-density nuclear equation of state from the phenomenology of compact stars and heavy-ion collisions
• Density Dependent Hadron Field Theory
• Asymmetric nuclear matter:the role of the isovector scalar channel
• A 2.1 Solar Mass Pulsar Measured by Relativistic Orbital Decay
• Density dependent hadron field theory for asymmetric nuclear matter and exotic nuclei
• Determination of the Mean-Field Momentum-Dependence using Elliptic Flow
• Dense Matter in Compact Stars: Theoretical Developments and Observational Constraints
• On the Lorentz structure of the symmetry energy
• The Relativistic Dirac-Brueckner Approach to Asymmetric Nuclear Matter
• Isospin effects on sub-threshold kaon production at intermediate energies
• Covariant representations of the relativistic Brueckner T-matrix and the nuclear matter problem
• Asymmetric Nuclear Matter in the Relativistic Brueckner Hartree Fock approach
• Near-threshold pion production with radioactive beams at the Rare Isotope Accelerator
• Momentum, Density, and Isospin dependence of the Symmetric and Asymmetric Nuclear Matter Properties
• Hybrid stars with the color dielectric and the MIT bag models
• Probing the equation of state with pions
• Probing the density dependence of the symmetry potential at low and high densities
• Instabilities in asymmetric nuclear matter
• Neutron stars with isovector scalar correlations
• Probing the symmetry energy and the degree of isospin equilibrium
• Heavy Ion Collisions at Relativistic Energies: Testing a Nuclear Matter at High Baryon and Isospin Density

Cited by in corpus (9)

• Kaon properties in (proto)neutron stars
• Symmetry Energy Effects on the Mixed Hadron-Quark Phase at High Baryon Density
• Effects of $\varphi$-meson on properties of hyperon stars in density dependent relativistic mean field model
• Phase transitions of hadronic to quark matter at finite T and μ_B
• $\delta$ meson effects on neutron stars in the modified quark-meson coupling model
• Constraining the Symmetry Energy: A Journey in the Isospin Physics from Coulomb Barrier to Deconfinement
• Moments of inertia of neutron stars in relativistic mean field theory: the role of the isovector scalar channel
• Vacuum fluctuation effects on asymmetric nuclear matter
• Heavy Ion Dynamics and Neutron Stars