arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0909.1313gr-qc
收藏

黑洞双星的高精度模拟:自旋与轨道angular momentum反对齐

High accuracy simulations of black hole binaries:spins anti-aligned with the orbital angular momentum

Tony Chu, Harald P. Pfeiffer, Mark A. Scheel

摘要:

对自旋与轨道角动量反对齐的黑洞进行了高精度的二元黑洞模拟。所研究的特殊情况代表了一个等质量双星,其自旋等量级为S/m^2=0.43757 \pm 0.00001。该系统的初始轨道偏心率约为4 e-5,经过10.6个轨道加上合并和衰荡演化。残余质量和自旋分别为M_f=(0.961109 \pm 0.000003)M和S_f/M_f^2=0.54781 \pm 0.00001,其中M为旋入早期的质量。在没有任何时间或相移的情况下,重力波形累积了<~ 0.1弧度的数值相位误差,并且当波形与适当的时间和相移对齐时,累积了<~ 0.01弧度的数值相位误差。使用相位精确到<~ 0.01弧度的程序将波形外推到无穷大,并且外推的波形与在有限半径r= 350 M处提取的波形相差高达0.13弧度的相位和大约百分之一的振幅。模拟采用不同的选择约束阻尼参数在波区,这大大减少了垃圾辐射的影响,允许提取一个干净的引力波信号,甚至在模拟的早期。

英文摘要:

High-accuracy binary black hole simulations are presented for black holes with spins anti-aligned with the orbital angular momentum. The particular case studied represents an equal-mass binary with spins of equal magnitude S/m^2=0.43757 \pm 0.00001. The system has initial orbital eccentricity ~4e-5, and is evolved through 10.6 orbits plus merger and ringdown. The remnant mass and spin are M_f=(0.961109 \pm 0.000003)M and S_f/M_f^2=0.54781 \pm 0.00001, respectively, where M is the mass during early inspiral. The gravitational waveforms have accumulated numerical phase errors of <~ 0.1 radians without any time or phase shifts, and <~ 0.01 radians when the waveforms are aligned with suitable time and phase shifts. The waveform is extrapolated to infinity using a procedure accurate to <~ 0.01 radians in phase, and the extrapolated waveform differs by up to 0.13 radians in phase and about one percent in amplitude from the waveform extracted at finite radius r=350M. The simulations employ different choices for the constraint damping parameters in the wave zone; this greatly reduces the effects of junk radiation, allowing the extraction of a clean gravitational wave signal even very early in the simulation.

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。

↑