Symmetry energy impact in simulations of core-collapse supernovae

  • Tobias Fischer
  • Matthias Hempel
  • Irina Sagert
  • Yudai Suwa
  • Jürgen Schaffner-Bielich
Open Access
Part of the following topical collections:
  1. Topical issue on Nuclear Symmetry Energy


We present a review of a broad selection of nuclear matter equations of state (EOSs) applicable in core-collapse supernova studies. The large variety of nuclear matter properties, such as the symmetry energy, which are covered by these EOSs leads to distinct outcomes in supernova simulations. Many of the currently used EOS models can be ruled out by nuclear experiments, nuclear many-body calculations, and observations of neutron stars. In particular the two classical supernova EOS describe neutron matter poorly. Nevertheless, we explore their impact in supernova simulations since they are commonly used in astrophysics. They serve as extremely soft and stiff representative nuclear models. The corresponding supernova simulations represent two extreme cases, e.g., with respect to the protoneutron star (PNS) compactness and shock evolution. Moreover, in multi-dimensional supernova simulations EOS differences have a strong effect on the explosion dynamics. Because of the extreme behaviors of the classical supernova EOSs we also include DD2, a relativistic mean field EOS with density-dependent couplings, which is in satisfactory agreement with many current nuclear and observational constraints. This is the first time that DD2 is applied to supernova simulations and compared with the classical supernova EOS. We find that the overall behaviour of the latter EOS in supernova simulations lies in between the two extreme classical EOSs. As pointed out in previous studies, we confirm the impact of the symmetry energy on the electron fraction. Furthermore, we find that the symmetry energy becomes less important during the post-bounce evolution, where conversely the symmetric part of the EOS becomes increasingly dominating, which is related to the high temperatures obtained. Moreover, we study the possible impact of quark matter at high densities and light nuclear clusters at low and intermediate densities.


Neutron Star Symmetry Energy Quark Matter Strange Quark Matter Neutron Matter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© The Author(s) 2014

Authors and Affiliations

  • Tobias Fischer
    • 1
  • Matthias Hempel
    • 2
  • Irina Sagert
    • 3
  • Yudai Suwa
    • 4
  • Jürgen Schaffner-Bielich
    • 5
  1. 1.Institute for Theoretical PhysicsUniversity of WroclawWroclawPoland
  2. 2.Departement PhysikUniversität BaselBaselSwitzerland
  3. 3.National Superconducting Cyclotron LaboratoryMichigan State UniversityEast LansingUSA
  4. 4.Yukawa Institute for Theoretical PhysicsKyoto UniversityKyotoJapan
  5. 5.Institut für Theoretische PhysikGoethe UniversitätFrankfurt am MainGermany

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