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arXiv 2212.04837gr-qcastro-ph.HEastro-ph.SR
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表述慢转中子星的 r-mode 问题

Formulating the r-mode problem for slowly rotating neutron stars

Nils Andersson, Fabian Gittins

AI总结:

本文利用更精确的成分分层描述重新审视了成熟中子星中的惯性 r-mode 问题,提出了两种针对非正压中子星的计算策略,并证明该问题的重新表述有望解决与共转点相关的奇异行为,从而指导未来的引力波搜索。

摘要:

我们重新审视了分层恒星中的惯性 r-mode 问题,利用了对成熟中子星成分分层更精确的描述。结果突出了传统方法处理该问题时的缺陷,促使我们重新思考非正压中子星 r-mode 的计算策略。我们概述了两种应对策略。对于中等至慢转中子星,唯一可行的替代方案可能是一开始就采用数值方法处理问题;而对于已知自转最快的恒星(可能因引力波发射而接近被驱动至不稳定状态),则可进行有意义的慢转计算。我们证明,后一种方法所产生的问题接近于正压惯性模式的问题,但并不完全相同。我们还提出,对该问题的这些重新表述很可能解决了旋转相对论性中子星中与共转点相关的奇异行为这一长期存在的问题。为了指导未来的引力波搜索,必须解决这一问题。

英文摘要:

We revisit the problem of inertial r-modes in stratified stars, drawing on a more precise description of the composition stratification in a mature neutron star. The results highlight issues with the traditional approach to the problem, leading us to rethink the computational strategy for r-modes of non-barotropic neutron stars. We outline two strategies for dealing with the problem. For moderate to slowly rotating neutron stars the only viable alternative may be to approach the problem numerically from the outset, while a meaningful slow-rotation calculation can be carried out for the fastest known spinning stars (which may be close to being driven unstable by the emission of gravitational waves). We demonstrate that the latter approach leads to a problem close, but not identical, to that for barotropic inertial modes. We also suggest that these reformulations of the problem likely resolve the long-standing problem of singular behaviour associated with a co-rotation point in rotating relativistic neutron stars. This issue needs to be resolved in order to guide future gravitational-wave searches.

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。

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