A new baryonic equation of state at sub-nuclear densities for core-collapse simulations

Shun Furusawa, Shoichi Yamada, Kohsuke Sumiyoshi, Hideyuki Suzuki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

We construct a new equation of state for baryons at sub-nuclear densities for the use in core-collapse simulations of massive stars. The formulation is based on the nuclear statistical equilibrium description and the liquid drop approximation of nuclei. The model free energy to minimize is calculated by using relativistic mean field theory for nucleons and the mass formula for nuclei with atomic number up to ∼ 1000. We have also taken into account the pasta phase. We find that the free energy and other thermodynamical quantities are not very different from those given in the standard EOSs that adopt the single nucleus approximation. On the other hand, the average mass is systematically different, which may have an important effect to the rates of electron captures and coherent neutrino scatterings on nuclei in supernova cores. It is also interesting that the root mean square of the mass number is not very different from the average mass number, since the former is important for the evaluation of coherent scattering rates on nuclei but has been unavailable so far.

Original languageEnglish
Title of host publicationOrigin of Matter and Evolution of Galaxies 2011
Pages369-371
Number of pages3
DOIs
Publication statusPublished - 2012 Dec 1
EventInternational Symposium on Origin of Matter and Evolutions of Galaxies 2011, OMEG 2011 - Wako, Japan
Duration: 2011 Nov 142011 Nov 17

Publication series

NameAIP Conference Proceedings
Volume1484
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Symposium on Origin of Matter and Evolutions of Galaxies 2011, OMEG 2011
CountryJapan
CityWako
Period11/11/1411/11/17

Keywords

  • Equation of state
  • Nuclear Abundances
  • Nuclear Pasta
  • Supernova

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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