arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2210.02550gr-qcastro-ph.HEcs.NAmath.NA
收藏

黑洞扰动守恒演化的时间对称数值方法

Conservative Evolution of Black Hole Perturbations with Time-Symmetric Numerical Methods

Michael F. O'Boyle, Charalampos Markakis, Lidia J. Gomes Da Silva, Rodrigo Panosso Macedo, Juan A. Valiente Kroon

摘要:

计划在未来十年内发射的LISA任务引起了人们对引力自作用力问题的关注。尽管有大量的理论工作,长期数值计算的引力波从极端质量比inspirals仍然具有挑战性。本文基于Hermite积分提出了一类适合于该问题的数值演化格式。它们最重要的特征是时间反演对称性和无条件稳定性,这使得这些方法能够在长时间内保持辛结构,能量,动量和其他Noether电荷。我们将Noether定理应用于Schwarzschild时空双曲切片上的黑洞微扰理论的主场,以表明存在数值模拟必须保持的演化常数。我们证明,时间对称积分计划的基础上的2点泰勒展开(如埃尔米特积分)数值保存这些数量,不像计划的基础上的1点泰勒展开(如龙格库塔)。这使得时间对称方案成为长时间EMRI模拟的理想选择。

英文摘要:

The scheduled launch of the LISA Mission in the next decade has called attention to the gravitational self-force problem. Despite an extensive body of theoretical work, long-time numerical computations of gravitational waves from extreme-mass-ratio-inspirals remain challenging. This work proposes a class of numerical evolution schemes suitable to this problem based on Hermite integration. Their most important feature is time-reversal symmetry and unconditional stability, which enables these methods to preserve symplectic structure, energy, momentum and other Noether charges over long time periods. We apply Noether's theorem to the master fields of black hole perturbation theory on a hyperboloidal slice of Schwarzschild spacetime to show that there exist constants of evolution that numerical simulations must preserve. We demonstrate that time-symmetric integration schemes based on a 2-point Taylor expansion (such as Hermite integration) numerically conserve these quantities, unlike schemes based on a 1-point Taylor expansion (such as Runge-Kutta). This makes time-symmetric schemes ideal for long-time EMRI simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑