SIMULATIONS OF CORE-COLLAPSE SUPERNOVAE IN SPATIAL AXISYMMETRY WITH FULL BOLTZMANN NEUTRINO TRANSPORT

Hiroki Nagakura, Wakana Iwakami, Shun Furusawa, Hirotada Okawa, Akira Harada, Kohsuke Sumiyoshi, Shoichi Yamada, Hideo Matsufuru, Akira Imakura

Research output: Contribution to journalArticlepeer-review

Abstract

We present the first results of our spatially axisymmetric core-collapse supernova simulations with full Boltzmann neutrino transport, which amount to a time-dependent 5-dimensional (2 in space and 3 in momentum space) problem in fact. Special relativistic effects are fully taken into account with a two-energy-grid technique. We performed two simulations for a progenitor of 11.2M, employing different nuclear equations-of-state (EOS’s): Lattimer and Swesty’s EOS with the incompressibility of K = 220MeV (LS EOS) and Furusawa’s EOS based on the relativistic mean field theory with the TM1 parameter set (FS EOS). In the LS EOS the shock wave reaches ∼ 700km at 300ms after bounce and is still expanding whereas in the FS EOS it stalled at ∼ 200km and has started to recede by the same time. This seems to be due to more vigorous turbulent motions in the former during the entire post-bounce phase, which leads to higher neutrino-heating efficiency in the neutrino-driven convection. We also look into the neutrino distributions in momentum space, which is the advantage of the Boltzmann transport over other approximate methods. We find non-axisymmetric angular distributions with respect to the local radial direction, which also generate off-diagonal components of the Eddington tensor. We find that the rθ-component reaches ∼ 10% of the dominant rr-component and, more importantly, it dictates the evolution of lateral neutrino fluxes, dominating over the θθ-component, in the semi-transparent region. These data will be useful to further test and possibly improve the prescriptions used in the approximate methods.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2017 Feb 6

Keywords

  • Neutrinos—hydrodynamics
  • Supernovae: general

ASJC Scopus subject areas

  • General

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