Convergence of Fourier-domain templates for inspiraling eccentric compact binaries

Convergence of Fourier-domain templates for inspiraling eccentric compact binaries
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激励偏心致密双星的傅里叶域模板的收敛性

DOI:
10.1103/physrevd.100.064006
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发表时间:
2019
期刊:
影响因子:
5
通讯作者:
Nishizawa, Atsushi
Nishizawa, Atsushi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Tanay, Sashwat;Klein, Antoine;Berti, Emanuele;Nishizawa, Atsushi

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空间探测器LISA可能会观测到恒星质量黑洞双星早期的引力波,其中一些可能具有显著的偏心率。当前的重力波形模板仅对小的轨道速度(即,在后牛顿扩展中)和小的初始偏心(后圆形扩展)有效。我们传统上定义了轨道频率为5 MHz的偏心率,并研究了精度高达2Pn的频域孤子模板的收敛性质[S.Tanay,M.Haney和A.Gopakumar,Phys.D93,064031(2016年)修订版]。我们计算了通过在相位级数中丢弃某些项而得到的完整模板和“简化”模板之间的所谓“不忠实性”;我们研究了系统误差相对于统计误差可以忽略的条件,并研究了统计误差的收敛性质。一般来说,由于参数之间的相关性,偏心波形比圆形波形产生更大的统计误差,但只要我们在相位中包括阶数或更高的项,误差估计就不会有明显的变化。
The space-based detector LISA may observe gravitational waves from the early inspiral of stellar-mass black hole binaries, some of which could have significant eccentricity. Current gravitational waveform templates are only valid for small orbital velocities (i.e., in a post-Newtonian expansion) and small initial eccentricity(“post-circular” expansion). We conventionally defineas the eccentricity corresponding to an orbital frequency of 5 mHz, and we study the convergence properties of frequency-domain inspiral templates that are accurate up to 2PN and orderin eccentricity [S. Tanay, M. Haney, and A. Gopakumar, Phys. Rev. D93, 064031 (2016)]. We compute the so-called “unfaithfulness” between the full template and “reduced” templates obtained by dropping some terms in the phasing series; we investigate the conditions under which systematic errors are negligible with respect to statistical errors, and we study the convergence properties of statistical errors. In general, eccentric waveforms lead to larger statistical errors than circular waveforms due to correlations between the parameters, but the error estimates do not change significantly as long as we include terms of orderor higher in the phasing.
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DOI: --
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