Bulletin of the American Physical Society
Four Corners Section 2022 Meeting
Volume 67, Number 14
Friday–Saturday, October 14–15, 2022; Albuquerque, New Mexico
Session F01: Poster Session
4:06 PM,
Friday, October 14, 2022
UNM
Room: PAIS 2nd Floor Mezzanine
Abstract: F01.00006 : Fully Dynamical General Relativistic SPH: Progress and Challenges*
Presenter:
Oleg Korobkin
(Los Alamos National Laboratory)
Author:
Oleg Korobkin
(Los Alamos National Laboratory)
Several previous works explored SPH in fixed curved geometries, or with limited relativistic approximations, and only one pioneered study with fully relativistic SPH (Rosswog & Diener 2021). Here, we present another SPH approach to fully general relativistic dynamical geometry with a new code SPaRTA (= Smoothed Particles for Relativistic Theoretical Astrophysics). It uses our own implementation of the Generalized Harmonic formulation of Einstein's equations for evolving the dynamical metric, featuring damping of constraint violations and rigorous stability proof in its first-order form. On the hydrodynamics side, SPaRTA builds upon the novel fixed-metric SPH approach of Tejeda et al. (2017), generalizing it to time-dependent curvilinear geometries. We will discuss progress and challenges in construction of the initial data for such setup using effective potentials, and present code tests.
*This work is supported by the LANL ASC Program and LDRD grant 20200145ER. This work used resources provided by the LANL Institutional Computing Program. LANL is operated by Triad National Security, LLC, for the National Nuclear Security Administration of the U.S.DOE (Contract No. 89233218CNA000001).
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