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arXiv 1105.3069gr-qcastro-ph.HE
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旋转相对论星的准径向稳定性判据

A quasi-radial stability criterion for rotating relativistic stars

Kentaro Takami, Luciano Rezzolla, Shin'ichirou Yoshida

摘要:

相对论恒星抵抗黑洞引力坍缩的稳定性是广义相对论中的经典问题。Friedman,Ipser and Sorkin(1988)建立了长期不稳定性的充分判据,他们证明了均匀旋转的正压恒星序列在转折点的一侧是长期不稳定的,然后认为一个更强的结果应该成立:序列应该在相反的一侧是稳定的,转折点标志着长期不稳定的开始。我们在这里表明,这一期望没有得到满足。通过在完全广义相对论中计算大量旋转恒星的$F$模频率,我们证明了中性稳定点,即,频率变为零的地方,不同于旋转恒星的转折点。通过数值模拟,我们验证了新的判据可以用来评估相对论旋转恒星的动力学稳定性。

英文摘要:

The stability properties of relativistic stars against gravitational collapse to black hole is a classical problem in general relativity. A sufficient criterion for secular instability was established by Friedman, Ipser and Sorkin (1988), who proved that a sequence of uniformly rotating barotropic stars is secularly unstable on one side of a turning point and then argued that a stronger result should hold: that the sequence should be stable on the opposite side, with the turning point marking the onset of secular instability. We show here that this expectation is not met. By computing in full general relativity the $F$-mode frequency for a large number of rotating stars, we show that the neutral-stability point, i.e., where the frequency becomes zero, differs from the turning point for rotating stars. Using numerical simulations we validate that the new criterion can be used to assess the dynamical stability of relativistic rotating stars.

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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