Binary neutron star mergers using a discontinuous Galerkin-finite difference hybrid method

IF 3.6 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Classical and Quantum Gravity Pub Date : 2024-11-11 DOI:10.1088/1361-6382/ad88cf

Nils Deppe, Francois Foucart, Marceline S Bonilla, Michael Boyle, Nicholas J Corso, Matthew D Duez, Matthew Giesler, François Hébert, Lawrence E Kidder, Yoonsoo Kim, Prayush Kumar, Isaac Legred, Geoffrey Lovelace, Elias R Most, Jordan Moxon, Kyle C Nelli, Harald P Pfeiffer, Mark A Scheel, Saul A Teukolsky, William Throwe and Nils L Vu

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引用次数: 0

Abstract

We present a discontinuous Galerkin-finite difference hybrid scheme that allows high-order shock capturing with the discontinuous Galerkin method for general relativistic magnetohydrodynamics in dynamical spacetimes. We present several optimizations and stability improvements to our algorithm that allow the hybrid method to successfully simulate single, rotating, and binary neutron stars. The hybrid method achieves the efficiency of discontinuous Galerkin methods throughout almost the entire spacetime during the inspiral phase, while being able to robustly capture shocks and resolve the stellar surfaces. We also use Cauchy-characteristic evolution to compute the first gravitational waveforms at future null infinity from binary neutron star mergers. The simulations presented here are the first successful binary neutron star inspiral and merger simulations using discontinuous Galerkin methods.

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使用非连续伽勒金-有限差分混合方法的双中子星合并

我们提出了一种非连续伽勒金-有限差分混合方案，它允许在动态时空中用非连续伽勒金方法对一般相对论磁流体动力学进行高阶冲击捕捉。我们对算法进行了多项优化和稳定性改进，使混合方法能够成功模拟单中子星、旋转中子星和双中子星。在吸气阶段，混合方法在几乎整个时空中都达到了非连续伽勒金方法的效率，同时能够稳健地捕捉冲击和解析恒星表面。我们还利用考奇特征演化来计算双中子星合并在未来空无穷远处的第一个引力波形。这里介绍的模拟是首次使用非连续伽勒金方法成功进行的双中子星吸气和合并模拟。

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来源期刊

Classical and Quantum Gravity 物理-天文与天体物理

CiteScore

7.00

自引率

8.60%

发文量

301

审稿时长

2-4 weeks

期刊介绍： Classical and Quantum Gravity is an established journal for physicists, mathematicians and cosmologists in the fields of gravitation and the theory of spacetime. The journal is now the acknowledged world leader in classical relativity and all areas of quantum gravity.