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arXiv 0910.4593gr-qc
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后牛顿初始条件下黑洞双星的闭极限近似

The Close-Limit Approximation for Black Hole Binaries with Post-Newtonian Initial Conditions

Alexandre Le Tiec, Luc Blanchet

摘要:

从二阶后牛顿(2 PN)初始条件出发,用闭限(CL)近似描述了两个轨道黑洞合并形成的黑洞的衰荡相.本文将点粒子双星的2 PN度规形式展开为CL形式,并将其与受扰Schwarzschild黑洞的2 PN度规等同起来。描述偶宇称(极性)和奇宇称(轴向)分量的线性扰动的多极系数始终满足2 PN-精确微扰场方程。我们使用这些系数来建立Regge-Wheeler和Zerilli波动方程的初始条件,然后对其进行数值演化。衰荡波形在两种情况下获得:零角动量的迎面碰撞,仅由偶数模式,和圆形轨道,其中偶数和奇数模式的贡献。在另一项工作中,这种形式主义被应用到研究的引力反冲过程中合并的二元黑洞的振铃阶段。

英文摘要:

The ringdown phase of a black hole formed from the merger of two orbiting black holes is described by means of the close-limit (CL) approximation starting from second-post-Newtonian (2PN) initial conditions. The 2PN metric of point-particle binaries is formally expanded in CL form and identified with that of a perturbed Schwarzschild black hole. The multipolar coefficients describing the even-parity (polar) and odd-parity (axial) components of the linear perturbation consistently satisfy the 2PN-accurate perturbative field equations. We use these coefficients to build initial conditions for the Regge-Wheeler and Zerilli wave equations, which we then evolve numerically. The ringdown waveform is obtained in two cases: head-on collision with zero-angular momentum, composed only of even modes, and circular orbits, for which both even and odd modes contribute. In a separate work, this formalism is applied to the study of the gravitational recoil produced during the ringdown phase of coalescing binary black holes.

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