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arXiv 1606.01769gr-qc
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在新的旋进规则中自旋致密双星的螺旋波形

Inspiral waveforms for spinning compact binaries in a new precessing convention

Anuradha Gupta, Achamveedu Gopakumar

摘要:

通常使用基于牛顿轨道角动量${\bf L}_{\rm N}$的进动约定来模拟一般旋转致密双星的螺旋引力波。这种进动惯例的一个关键特征是它能够从轨道相位演化中去除所有自旋进动引起的调制。然而,这种约定通常采用后牛顿(PN)精确的岁差方程,适用于PN精确的轨道角动量${\bf L}$,以发展基于${\bf L}_{\rm N}$的岁差源框架。这促使我们在旋进惯例中开发出旋转致密双星的螺旋波形,该惯例明确使用${\bf L}$来描述双星轨道。我们的方法介绍了某些额外的3PN阶项的轨道相位和频率演化方程相对于通常的${\bf L}_{\rm N}$为基础的实现的旋进公约。通过计算采用${\bf L}$和基于${\bf L}_{\rm N}$的处理约定的螺旋波形之间的匹配来探索这些附加项的含义。我们发现,匹配估计是小于最佳值,即0.97,对于一个不可忽略的部分不等质量旋转致密双星。

英文摘要:

It is customary to use a precessing convention, based on Newtonian orbital angular momentum ${\bf L}_{\rm N}$, to model inspiral gravitational waves from generic spinning compact binaries. A key feature of such a precessing convention is its ability to remove all spin precession induced modulations from the orbital phase evolution. However, this convention usually employs a post-Newtonian (PN) accurate precessional equation, appropriate for the PN accurate orbital angular momentum ${\bf L}$, to evolve the ${\bf L}_{\rm N}$-based precessing source frame. This motivated us to develop inspiral waveforms for spinning compact binaries in a precessing convention that explicitly use ${\bf L}$ to describe the binary orbits. Our approach introduces certain additional 3PN order terms in the orbital phase and frequency evolution equations with respect to the usual ${\bf L}_{\rm N}$-based implementation of the precessing convention. The implications of these additional terms are explored by computing the match between inspiral waveforms that employ ${\bf L}$ and ${\bf L}_{\rm N}$-based precessing conventions. We found that the match estimates are smaller than the optimal value, namely 0.97, for a non-negligible fraction of unequal mass spinning compact binaries.

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