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arXiv 1105.3567gr-qc
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在极端和中等质量比吸气的模拟中包括小物体自旋效应的重要性

Importance of including small body spin effects in the modelling of extreme and intermediate mass-ratio inspirals

E. A. Huerta, Jonathan R. Gair

摘要:

我们探索未来的低频引力波探测器的能力,以测量恒星质量和中等质量的黑洞,螺旋到超大质量克尔黑洞(SMBH)的自旋。我们开发了一个组装的波形模型的基础上的运动方程由Saijo等人。[物理评论D 58,064005,1998]自旋BH二进制,增加了自旋轨道和自旋自旋耦合从微扰和后牛顿(PN)计算,以及相关的保守的自作用力修正,通过比较PN的结果。我们使用精确的通量,其中包括微扰校正的自旋的inspiralling机构,自旋自旋耦合和高阶适合Teukolsky方程的解决方案的inspiral阶段。我们提出的蒙特卡罗模拟的参数估计误差和模型误差时,我们忽略了保守的波形模板的校正结果。对于信噪比为1000的5000+10^6太阳质量的源,LISA将能够确定两个质量,误差在~0.001的分数范围内,测量SMBH的自旋幅度q和螺旋BH的自旋幅度分别为0.0001,10%,并确定源在天空中的位置和SMBH自旋方向,误差在0.0001球面度以内。对于信噪比为30的10+10^6太阳质量系统,LISA将无法确定螺旋BH的自旋幅度,尽管其他波形参数的测量不会因自旋的存在而显着降低。忽略保守修正引起的模型误差对于质量比高于0.0001变得显著,但是包括高达2 PN阶的这些修正可能足以将这些系统误差减小到可接受的水平。

英文摘要:

We explore the ability of future low-frequency gravitational wave detectors to measure the spin of stellar mass and intermediate mass black holes that inspiral onto super-massive Kerr black holes (SMBHs). We develop a kludge waveform model based on the equations of motion derived by Saijo et al. [Phys Rev D 58, 064005, 1998] for spinning BH binaries, augmented with spin-orbit and spin-spin couplings taken from perturbative and post-Newtonian (PN) calculations, and the associated conservative self-force corrections, derived by comparison to PN results. We model the inspiral phase using accurate fluxes which include perturbative corrections for the spin of the inspiralling body, spin-spin couplings and higher-order fits to solutions of the Teukolsky equation. We present results of Monte Carlo simulations of parameter estimation errors and of the model errors that arise when we omit conservative corrections from the waveform template. For a source 5000+10^6 solar mass observed with an SNR of 1000, LISA will be able to determine the two masses to within a fractional error of ~0.001, measure the SMBH spin magnitude, q, and the spin magnitude of the inspiralling BH to 0.0001, 10%, respectively, and determine the location of the source in the sky and the SMBH spin orientation to within 0.0001 steradians. For a 10+10^6 solar mass system observed with SNR of 30, LISA will not be able to determine the spin magnitude of the inspiralling BH, although the measurement of the other waveform parameters is not significantly degraded by the presence of spin. The model errors which arise from ignoring conservative corrections become significant for mass-ratios above 0.0001, but including these corrections up to 2PN order may be sufficient to reduce these systematic errors to an acceptable level.

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