A Parametric Study of the SASI Comparing General Relativistic and Nonrelativistic Treatments*

2023/07/20 by Samuel J. Dunham, Samuel Dunham, Eirik Endeve +5 · 1 voice
Physics and Astronomy · #Astrophysical Phenomena and Observations #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #astro-ph.HE #astro-ph.SR #gr-qc #physics.flu-dyn

paper · pdf · doi:10.3847/1538-4357/ad206c

arxiv published 2023/07/20 · openalex publication_date 2024/03/01 · arxiv updated 2024/03/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/22

Abstract

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 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.

Citations

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Discussions

• Paper day! Link: https://arxiv.org/abs/2307.10904 We looked at how GR affects the SASI. The punchline is that GR is needed in order to accurately capture the SASI dynamics. If you have any questions o [bsky, 3 points, 0 comments]

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