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Title: The impact of different neutrino transport methods on multidimensional core-collapse supernova simulations

Journal Article · · Journal of Physics. G, Nuclear and Particle Physics
ORCiD logo [1];  [2]; ORCiD logo [3];  [4];  [5];  [6]
  1. Michigan State Univ., East Lansing, MI (United States); National Tsing Hua Univ., Hsinchu (Taiwan); DOE/OSTI
  2. Darmstadt Univ. of Technology (Germany)
  3. Stockholm Univ. (Sweden)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Istituto Nazionale di Fisica Nucleare (INFN), Parma (Italy); Univ. degli Studi di Milano-Bicocca (Italy)
  6. Darmstadt Univ. of Technology (Germany); GSI-Darmstadt (Germany)

Neutrinos play a crucial role in the core-collapse supernova (CCSN) explosion mechanism. The requirement of accurately calculating the transport of neutrinos makes simulations of the CCSN mechanism extremely challenging and computationally expensive. Historically, this stiff challenge has been met by making approximations to the full transport equation. In this work, we compare CCSN simulations in one- and two-dimensions with three approximate neutrino transport schemes, each implemented in the FLASH simulation framework. We compare a two-moment M1 scheme with an analytic closure (M1), the isotropic diffusion source approximation (IDSA), and the advanced spectral leakage method. We identify and discuss the advantages and disadvantages of each scheme. For each approximate transport scheme, we use identical grid setups, hydrodynamics, and gravity solvers to investigate the transport effects on supernova shock dynamics and neutrino quantities. We find that the transport scheme has a small effect on the evolution of protoneutron star (PNS) radius, PNS mass, and the mass accretion rate. The neutrino luminosities, mean energies, and shock radii have a ~10%–20% quantitative difference but the overall qualitative trends are fairly consistent between all three approximations. We find larger differences in the gain region properties, including the gain region mass and the net heating rate in the gain region, as well as the strength of PNS convection in the core. We investigate the progenitor, nuclear equation of state, and stochastic perturbation dependence of our simulations and find similar magnitudes of impact on key quantities. We also compare the computational expense of the various approximations.

Research Organization:
Michigan State University, East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0015904; SC0017955
OSTI ID:
1612344
Journal Information:
Journal of Physics. G, Nuclear and Particle Physics, Journal Name: Journal of Physics. G, Nuclear and Particle Physics Journal Issue: 1 Vol. 46; ISSN 0954-3899
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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A multidimensional implementation of the Advanced Spectral neutrino Leakage scheme journal October 2019
A multi-dimensional implementation of the Advanced Spectral neutrino Leakage scheme text January 2019