A Parametric Study of the SASI Comparing General Relativistic and Nonrelativistic Treatments
Abstract
We present numerical results from a parameter study of the standing accretion shock instability (SASI), investigating the impact of general relativity (GR) on the dynamics. Using GR hydrodynamics with GR gravity, and nonrelativistic (NR) hydrodynamics with Newtonian gravity, in an idealized model setting, we vary the initial radius of the shock and, by varying its mass and radius in concert, the proto-neutron star (PNS) compactness. We investigate four compactnesses expected in a post-bounce core-collapse supernova (CCSN). We find that GR leads to a longer SASI oscillation period, with ratios between the GR and NR cases as large as 1.29 for the highest-compactness suite. We also find that GR leads to a slower SASI growth rate, with ratios between the GR and NR cases as low as 0.47 for the highest-compactness suite. We discuss implications of our results for CCSN simulations.
Keywords
Cite
@article{arxiv.2307.10904,
title = {A Parametric Study of the SASI Comparing General Relativistic and Nonrelativistic Treatments},
author = {Samuel J. Dunham and Eirik Endeve and Anthony Mezzacappa and John M. Blondin and Jesse Buffaloe and Kelly Holley-Bockelmann},
journal= {arXiv preprint arXiv:2307.10904},
year = {2024}
}
Comments
21 pages, 11 figures. Updated to match published version