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arXiv 1302.4035gr-qcastro-ph.CO
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共振旋入克尔黑洞的卡特常数的演化:I.标量情形

Evolution of the Carter constant for a resonant inspiral into a Kerr black hole: I. The scalar case

Soichiro Isoyama, Ryuichi Fujita, Hiroyuki Nakano, Norichika Sago, Takahiro Tanaka

摘要:

我们讨论了小天体围绕Kerr黑洞的内旋。当辐射反应的时间尺度比其轨道周期足够长时,首阶轨道演化仅由运动常数的平均演化的知识来描述,即,能量、方位角动量和卡特常数。虽然不存在由对应于卡特常数的扰动场组成的守恒流,但当径向振荡和极向振荡同时存在转折点时,卡特常数的平均变化率可以用一个简单的公式给出。然而,一个螺旋轨道可能会穿过一个“共振”点,在那里径向和极轨道振荡的频率是一个合理的比例。在共振点上,人们通常找不到同时的转折点。因此,即使对于卡特常数的平均变化率,直接计算“自作用力”,这仍然是具有挑战性的,特别是在克尔背景的情况下,似乎是必要的。在本文中,我们提出了一种方法,计算卡特常数的平均变化率在一个相对简单的方式在“共振”点。

英文摘要:

We discuss the inspiral of a small body around a Kerr black hole. When the time scale of the radiation reaction is sufficiently longer than its orbital period, the leading order orbital evolution is described only by the knowledge of the averaged evolution of the constants of motion, i.e., the energy, azimuthal angular momentum and the Carter constant. Although there is no conserved current composed of the perturbation field corresponding to the Carter constant, it has been shown that the averaged rate of change of the Carter constant can be given by a simple formula, when there exists a simultaneous turning point of the radial and polar oscillations. However, an inspiralling orbit may cross a "resonance" point, where the frequencies of the radial and polar orbital oscillations are in a rational ratio. At the resonance point, one cannot find a simultaneous turning point in general. Hence, even for the averaged rate of change of the Carter constant, a direct computation of the 'self-force", which is still challenging especially in the case of the Kerr background, seems to be necessary. In this paper, we present a method of computing the averaged rate of change of the Carter constant in a relatively simple manner at the "resonance" point.

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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