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Proposing Institution

Max Planck Institute for Astrophysics
Project Manager

Apl. Prof. Dr. rer. nat. Hans-Thomas Janka
Karl-Schwarzschild-Str. 1
85748 Garching
In order to investigate the complex physics of core-collapse supernovae, large-scale computer simulations connecting hydrodynamics, relativistic gravity as well as neutrino interactions and transport in a self-consistent way are indispensable. For this purpose a new, fully 3D neutrino transport code, ALCAR, was developed.Although our first simulations in three dimensions (3D) with the VERTEX-PROMETHEUS code provided important insights into the neutrino-driven explosion mechanism and successful explosions could be obtained, all simulations up to now have employed the so-called "ray-by-ray" (RbR) approximation for the neutrino transport. With our new ALCAR code, we are able to overcome the RbR approximation and can thus assess the validity of the previous simulations.Our new ALCAR code is a three-dimensional neutrino radiation transport and hydrodynamics code with energy bin coupling for neutrinos, including velocity dependent terms up to order v/c. In contrast to the VERTEX-PROMETHEUS code, our new code is based on a fully multidimensional (FMD) two-moment scheme that evolves all three flux components instead of considering only the radial one. To close the system of neutrino energy and momentum equations, we currently apply an analytical Eddington tensor.In order to compare the new neutrino radiation transport scheme to the RbR approximation used in previous simulations, our new code can apply both the FMD scheme and the RbR method. Thus, we can directly assess the differences of both radiation transport approximations by the use of one code, avoiding difficult code-to-code comparisons.As a preparation for this project, we have already started to perform two low-resolution simulations in 3D with one run employing the RbR approximation and the other run using the FMD scheme. Both simulations and a detailed analysis of them are ongoing at the moment with interesting first results. These demand further exploration with higher resolution to test the convergence of the results and to consolidate our preliminary low-resolution results. After successfully testing our code on the SuperMUC hardware using our test account, we are well prepared to directly start the high-resolution 3D simulations.

Impressum, Conny Wendler