2026/01/22 by Christian Y. Cardall, Reuben D. Budiardja, R. Daniel Murphy +1
Physics and Astronomy · Earth and Planetary Sciences · #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #Earth Systems and Cosmic Evolution
paper · pdf · doi:10.3847/1538-4365/ae825b
Abstract The General Astrophysical Simulation System is a code being developed initially and primarily, though not exclusively, for the simulation of core-collapse supernovae on the world’s leading capability supercomputers. This paper—the second in a series—documents capabilities for Newtonian self-gravitating fluid dynamics, including tabulated microphysical equations of state treating nuclei and nuclear matter (“baryonic matter”). Computation of the gravitational potential of a spheroid, and simulation of the gravitational collapse of dust and of an ideal fluid, provide tests of self-gravitation against known solutions. In multidimensional computations of the adiabatic collapse, bounce, and explosion of spherically symmetric presupernova progenitors—which we propose become a standard benchmark for code comparisons—we find that the explosions are prompt and remain spherically symmetric (as expected), with an average shock expansion speed and total kinetic energy that are inversely correlated with the progenitor mass at the onset of collapse and the compactness parameter.