arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.3605gr-qc
收藏

极端质量比吸气中的共振:渐近和超渐近分析

Resonances in Extreme Mass-Ratio Inspirals: Asymptotic and Hyperasymptotic Analysis

Jonathan R Gair, Nicolas Yunes, Carl M Bender

摘要:

对于未来的太空探测器来说,引力波的一个预期来源是小型紧凑物体进入更大质量的黑洞的螺旋。这些来源有可能提供有关天文学和基础物理学的丰富信息。在短时间尺度上,小物体的轨道近似于测地线。克尔黑洞时空的一般测地线有一个完整的积分集,可以用运动的三个频率来表征。在螺旋上升的过程中,一个典型的系统将通过共振,其中两个频率变得相称。共振的效果将是在共振期间显著改变螺旋上升的速率。了解这些共振对引力波定相的影响对于探测和利用这些信号进行天体物理和基础物理研究非常重要。两个微分方程,可能会描述通过这样的共振的inspiral通道进行调查。这些不同取决于是运动的傅立叶展开的相位分量还是频率分量被认为是通过共振连续的。渐近分析和超渐近分析被用来找到一个系统,通过共振的解决方案的后期时间的分析行为。线性增长(弱共振)或线性衰减(强共振)的解决方案被发现取决于共振的强度。在弱共振的情况下,频率共振会在引力频率演化上留下印记(共振记忆)。弱共振和强共振之间的过渡以平方根奇点为特征,当人们从上面接近这种过渡时,频率共振方程的解以指数速度聚集成族。

英文摘要:

An expected source of gravitational waves for future detectors in space are the inspirals of small compact objects into much more massive black holes. These sources have the potential to provide a wealth of information about astronomy and fundamental physics. On short timescales the orbit of the small object is approximately geodesic. Generic geodesics for a Kerr black hole spacetime have a complete set of integrals and can be characterized by three frequencies of the motion. Over the course of an inspiral, a typical system will pass through resonances where two of these frequencies become commensurate. The effect of the resonance will be to alter significantly the rate of inspiral for the duration of the resonance. Understanding the impact of these resonances on gravitational wave phasing is important to detect and exploit these signals for astrophysics and fundamental physics. Two differential equations that might describe the passage of an inspiral through such a resonance are investigated. These differ depending on whether it is the phase or the frequency components of a Fourier expansion of the motion that are taken to be continuous through the resonance. Asymptotic and hyperasymptotic analysis are used to find the late-time analytic behavior of the solution for a system that has passed through a resonance. Linearly growing (weak resonances) or linearly decaying (strong resonances) solutions are found depending on the strength of the resonance. In the weak-resonance case, frequency resonances leave an imprint (a resonant memory) on the gravitational frequency evolution. The transition between weak and strong resonances is characterized by a square-root singularity, and as one approaches this transition from above, the solutions to the frequency resonance equation bunch up into families exponentially fast.

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。

↑