关于引力相互作用中次主导阶自旋-自旋效应的最新文献评述
Comment on recent papers regarding next-to-leading order spin-spin effects in gravitational interaction
摘要：
Porto和Rothstein最近关于引力自旋-自旋耦合的论文中的四分体不应该具有给定的形式。Steinhoff、Hergt和Schaefer认为四分体的固定是自旋平方动力学中发现的不一致的可能来源。然而，这种不一致性只会出现在次领先阶自旋轨道动力学中，而不会出现在自旋平方动力学中。相反，在次领先阶自旋平方水平上发现的分歧是由于Porto和Rothstein在自旋平方论文中的符号输入错误。
英文摘要：
It is argued that the tetrad in a recent paper by Porto and Rothstein on gravitational spin-spin coupling should not have the given form. The fixation of that tetrad was suggested by Steinhoff, Hergt, and Schaefer as a possible source for the disagreement found in the spin-squared dynamics. However, this inconsistency will only show up in the next-to-leading order spin-orbit dynamics and not in the spin-squared dynamics. Instead, the disagreement found at the next-to-leading order spin-squared level is due to a sign typo in the spin-squared paper by Porto and Rothstein.
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