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

Anthony Mezzacappa; Eirik Endeve; Jesse Buffaloe; John M. Blondin; Kelly Holley-Bockelmann; Samuel J. Dunham

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

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arxiv 2307.10904 v2 pith:DJIX4VIJ submitted 2023-07-20 astro-ph.HE astro-ph.SRgr-qcphysics.flu-dyn

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

Samuel J. Dunham , Eirik Endeve , Anthony Mezzacappa , John M. Blondin , Jesse Buffaloe , Kelly Holley-Bockelmann This is my paper

classification astro-ph.HE astro-ph.SRgr-qcphysics.flu-dyn

keywords sasicasesccsnfindgeneralgravityhighest-compactnesshydrodynamics

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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.

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