http://arxiv.org/abs/1806.09184
Modeling core-collapse supernova with neutrino transport in three dimensions requires tremendous computing resources and some level of approximations. We present a first comparison study of core-collapse supernovae in 3D with different physics approximations and hydrodynamic codes. We aim to assess the impact of the hydrodynamic code, approximations for the neutrino and gravity treatments and rotation, on the simulation of core-collapse supernovae in 3D. We use four different hydrodynamic codes in this work (ELEPHANT, FLASH, fGR1, and SPHYNX), jointly with two different neutrino treatments (IDSA and M1) plus three different gravity treatments (Newtonian, 1D General Relativity correction, and full GR). Additional parameters discussed in this study are the inclusion of neutrino-electron scattering via a parametrized deleptonization and the influence of rotation. The four codes compared in this work include Eulerian and fully Lagrangian (SPH) codes for first time. They show agreement in the overall evolution of the collapse phase and early postbounce within the range of 10% (20% in few cases). The comparison of the different neutrino treatments highlights the need to further investigate the antineutrino luminosities in IDSA, which tend to be rather high. We also pinpoint the need of including a more detailed heavy-lepton neutrino leakage. When comparing with a full GR code, including an M1 transport method, we confirmed the influence of neutrino-electron scattering during the collapse phase, which is adequately captured by the parametrized deleptonization scheme. Also the effective general relativistic potential reproduces the overall dynamic evolution correctly in all Newtonian codes. Additionally, we could verify that rotation aids to the shock expansion and were able to estimate the overall angular momentum losses for each code in rotating scenarios.
R. Cabezón, K. Pan, M. Liebendörfer, et. al.
Tue, 26 Jun 18
18/71
Comments: 19 pages, 11 figures, 4 Tables. Submitted to A&A