Second relativistic mean field and virial equation of state for astrophysical simulations

Journal Article · Wed Jun 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.065808· OSTI ID:21502830

Shen, G; Horowitz, C J; O'Connor, E ^[1]

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1. Theoretical Division, Los Alamos National Lab, Los Alamos, New Mexico 87545 (United States) and Center for the Exploration of Energy and Matter and Department of Physics, Indiana University Bloomington, Indiana 47405 (United States)

We generate a second equation of state (EOS) of nuclear matter for a wide range of temperatures, densities, and proton fractions for use in supernovae, neutron star mergers, and black hole formation simulations. We employ full relativistic mean field (RMF) calculations for matter at intermediate density and high density, and the virial expansion of a nonideal gas for matter at low density. For this EOS we use the RMF effective interaction FSUGold, whereas our earlier EOS was based on the RMF effective interaction NL3. The FSUGold interaction has a lower pressure at high densities compared to the NL3 interaction. We calculate the resulting EOS at over 100 000 grid points in the temperature range T=0 to 80 MeV, the density range n{sub B}=10{sup -8} to 1.6 fm{sup -3}, and the proton fraction range Y{sub p}=0 to 0.56. We then interpolate these data points using a suitable scheme to generate a thermodynamically consistent equation of state table on a finer grid. We discuss differences between this EOS, our NL3-based EOS, and previous EOSs by Lattimer-Swesty and H. Shen et al. for the thermodynamic properties, composition, and neutron star structure. The original FSUGold interaction produces an EOS, which we call FSU1.7, that has a maximum neutron star mass of 1.7 solar masses. A modification in the high-density EOS is introduced to increase the maximum neutron star mass to 2.1 solar masses and results in a slightly different EOS that we call FSU2.1. The EOS tables for FSU1.7 and FSU2.1 are available for download.

• OSTI ID: 21502830
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 6; Other Information: DOI: 10.1103/PhysRevC.83.065808; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
BLACK HOLES
DENSITY
EQUATIONS OF STATE
EXPANSION
INTERACTIONS
MASS
MEAN-FIELD THEORY
MEV RANGE
NEUTRON STARS
NUCLEAR MATTER
PROTONS
RELATIVISTIC RANGE
SIMULATION
SUPERNOVAE
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
VIRIAL EQUATION
BARYONS
BINARY STARS
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
ERUPTIVE VARIABLE STARS
FERMIONS
HADRONS
MATTER
NUCLEONS
PHYSICAL PROPERTIES
PHYSICS
STARS
VARIABLE STARS