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arXiv 2203.13832gr-qc
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偏心轨道非自旋极质量比螺线红移不变量的高阶后牛顿展开

High-order post-Newtonian expansion of the redshift invariant for eccentric-orbit non-spinning extreme-mass-ratio inspirals

Christopher Munna, Charles R. Evans

摘要:

计算了Schwarzschild背景下偏心轨道极端质量比吸气的广义红移不变量$\langle u^t \rangle_τ$的高阶后牛顿(PN)级数对偏心率的依赖性。这些结果是在一阶黑洞微扰理论(BHPT)下,使用Regge-Wheeler-Zerilli(RWZ)规范计算的。我们的\textsc{Mathematica}代码是基于一个熟悉的程序,使用PN扩展的Mano-Suzuki-Takasugi(MST)解析函数形式主义的$l$模式达到一定的最大值,然后使用一个直接的一般- $l$ PN扩展的RWZ方程任意高的$l$。我们计算了PN阶和偏心率幂的对偶展开式,达到10 PN相对阶和$e^{20}$。详细的知识,在每个PN阶的偏心率膨胀,使我们能够找到偏心率依赖众多的封闭形式的表达式和多个无穷级数与已知的系数。我们发现领先的对数序列的PN扩展的红移不变量,反映了类似的行为,在PN扩展的能流到无穷大。一组通量项和特殊的功能,出现在能量通量,如Peters-Mathews通量本身,被证明是重新出现在红移PN扩展。

英文摘要:

We calculate the eccentricity dependence of the high-order post-Newtonian (PN) series for the generalized redshift invariant $\langle u^t \rangle_τ$ for eccentric-orbit extreme-mass-ratio inspirals on a Schwarzschild background. These results are calculated within first-order black hole perturbation theory (BHPT) using Regge-Wheeler-Zerilli (RWZ) gauge. Our \textsc{Mathematica} code is based on a familiar procedure, using PN expansion of the Mano-Suzuki-Takasugi (MST) analytic function formalism for $l$ modes up to a certain maximum and then using a direct general-$l$ PN expansion of the RWZ equation for arbitrarily high $l$. We calculate dual expansions in PN order and in powers of eccentricity, reaching 10PN relative order and $e^{20}$. Detailed knowledge of the eccentricity expansion at each PN order allows us to find within the eccentricity dependence numerous closed-form expressions and multiple infinite series with known coefficients. We find leading logarithm sequences in the PN expansion of the redshift invariant that reflect a similar behavior in the PN expansion of the energy flux to infinity. A set of flux terms and special functions that appear in the energy flux, like the Peters-Mathews flux itself, are shown to reappear in the redshift PN expansion.

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