Nuclear equation of state for core-collapse supernovae with realistic nuclear forces

H. Togashi, Y. Takehara, S. Yamamuro, K. Nakazato, H. Suzuki, K. Sumiyoshi, Masatoshi Takano

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

    Abstract

    We propose a new nuclear equation of state (EOS) for numerical simulations of core-collapse supernovae (SNe) using the variational many-body theory with realistic nuclear forces. Starting from the nuclear Hamiltonian composed of the Argonne v18 two-body potential and Urbana IX three-body potential, we first construct the EOS of uniform nuclear matter by the cluster varia- tional method. The obtained free energies of pure neutron matter and symmetric nuclear matter are in good agreement with those of Fermi hypernetted chain variational calculations. Moreover, the mass-radius relation of neutron stars derived from this EOS at zero temperature is consis- tent with recent observational data. Using the free energies of uniform nuclear matter based on the realistic nuclear Hamiltonian, we then construct the EOS for non-uniform nuclear matter by the Thomas-Fermi calculation. The obtained phase diagram of hot nuclear matter is reasonable as compared with the Shen EOS, and thermodynamic quantities in the non-uniform phase with the present EOS are similar to those with the Shen EOS. Finally, the present EOS is applied to a spherically symmetric adiabatic numerical simulation of SNe. We confirm that our EOS is successfully applied to this hydrodynamics simulation. It is also seen that the present EOS in a relatively large proton fraction is softer than the Shen EOS, which is consistent with the fact that the incompressibility of the present EOS is smaller than that of the Shen EOS.

    Original languageEnglish
    Title of host publicationProceedings of Science
    PublisherProceedings of Science (PoS)
    Volume07-11-July-2015
    Publication statusPublished - 2014
    Event13th Nuclei in the Cosmos, NIC 2014 - Debrecen, Hungary
    Duration: 2014 Jul 72014 Jul 11

    Other

    Other13th Nuclei in the Cosmos, NIC 2014
    CountryHungary
    CityDebrecen
    Period14/7/714/7/11

    ASJC Scopus subject areas

    • General

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    Togashi, H., Takehara, Y., Yamamuro, S., Nakazato, K., Suzuki, H., Sumiyoshi, K., & Takano, M. (2014). Nuclear equation of state for core-collapse supernovae with realistic nuclear forces. In Proceedings of Science (Vol. 07-11-July-2015). [169] Proceedings of Science (PoS).