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

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

Research output: Contribution to journalArticle

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
Article number169
JournalProceedings of Science
Volume07-11-July-2015
Publication statusPublished - Jan 1 2014
Externally publishedYes

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supernovae
equations of state
free energy
incompressibility
simulation
neutron stars
hydrodynamics
phase diagrams
neutrons
thermodynamics
radii
protons

All Science Journal Classification (ASJC) codes

  • General

Cite this

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. Proceedings of Science, 07-11-July-2015, [169].

Nuclear equation of state for core-collapse supernovae with realistic nuclear forces. / Togashi, H.; Takehara, Y.; Yamamuro, S.; Nakazato, Kenichiro; Suzuki, H.; Sumiyoshi, K.; Takano, M.

In: Proceedings of Science, Vol. 07-11-July-2015, 169, 01.01.2014.

Research output: Contribution to journalArticle

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', Proceedings of Science, vol. 07-11-July-2015, 169.
Togashi H, Takehara Y, Yamamuro S, Nakazato K, Suzuki H, Sumiyoshi K et al. Nuclear equation of state for core-collapse supernovae with realistic nuclear forces. Proceedings of Science. 2014 Jan 1;07-11-July-2015. 169.
Togashi, H. ; Takehara, Y. ; Yamamuro, S. ; Nakazato, Kenichiro ; Suzuki, H. ; Sumiyoshi, K. ; Takano, M. / Nuclear equation of state for core-collapse supernovae with realistic nuclear forces. In: Proceedings of Science. 2014 ; Vol. 07-11-July-2015.
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