A new equation of state based on nuclear statistical equilibrium for core-collapse simulations

Shun Furusawa, Shoichi Yamada, Kohsuke Sumiyoshi, Hideyuki Suzuki

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

    Abstract

    We calculate a new equation of state for baryons at sub-nuclear densities for the use in core-collapse simulations of massive stars. The formulation is the nuclear statistical equilibrium description and the liquid drop approximation of nuclei. The model free energy to minimize is calculated by 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 on the rates of electron captures and coherent neutrino scatterings on nuclei in supernova cores.

    Original languageEnglish
    Title of host publicationProceedings of the International Astronomical Union
    Pages333-334
    Number of pages2
    Volume7
    EditionS279
    DOIs
    Publication statusPublished - 2011 Apr

    Publication series

    NameProceedings of the International Astronomical Union
    NumberS279
    Volume7
    ISSN (Print)17439213
    ISSN (Electronic)17439221

    Fingerprint

    equations of state
    nuclei
    simulation
    free energy
    approximation
    massive stars
    electron capture
    nucleons
    supernovae
    baryons
    neutrinos
    formulations
    scattering

    Keywords

    • dense matter
    • equation of state
    • nuclear abundances & supernovae

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

    Cite this

    Furusawa, S., Yamada, S., Sumiyoshi, K., & Suzuki, H. (2011). A new equation of state based on nuclear statistical equilibrium for core-collapse simulations. In Proceedings of the International Astronomical Union (S279 ed., Vol. 7, pp. 333-334). (Proceedings of the International Astronomical Union; Vol. 7, No. S279). https://doi.org/10.1017/S174392131201321X

    A new equation of state based on nuclear statistical equilibrium for core-collapse simulations. / Furusawa, Shun; Yamada, Shoichi; Sumiyoshi, Kohsuke; Suzuki, Hideyuki.

    Proceedings of the International Astronomical Union. Vol. 7 S279. ed. 2011. p. 333-334 (Proceedings of the International Astronomical Union; Vol. 7, No. S279).

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

    Furusawa, S, Yamada, S, Sumiyoshi, K & Suzuki, H 2011, A new equation of state based on nuclear statistical equilibrium for core-collapse simulations. in Proceedings of the International Astronomical Union. S279 edn, vol. 7, Proceedings of the International Astronomical Union, no. S279, vol. 7, pp. 333-334. https://doi.org/10.1017/S174392131201321X
    Furusawa S, Yamada S, Sumiyoshi K, Suzuki H. A new equation of state based on nuclear statistical equilibrium for core-collapse simulations. In Proceedings of the International Astronomical Union. S279 ed. Vol. 7. 2011. p. 333-334. (Proceedings of the International Astronomical Union; S279). https://doi.org/10.1017/S174392131201321X
    Furusawa, Shun ; Yamada, Shoichi ; Sumiyoshi, Kohsuke ; Suzuki, Hideyuki. / A new equation of state based on nuclear statistical equilibrium for core-collapse simulations. Proceedings of the International Astronomical Union. Vol. 7 S279. ed. 2011. pp. 333-334 (Proceedings of the International Astronomical Union; S279).
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