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arXiv 2502.06262gr-qcastro-ph.COhep-th
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共形 Killing 引力的自洽性问题

Consistency Problems of Conformal Killing Gravity

Emel Altas, Bayram Tekin

AI总结:

该研究指出共形 Killing 引力因场方程张量秩大于 2 导致积分常数无法用守恒量解释,从而在黑洞能量角动量定义及引力波弱场公式方面存在自洽性问题。

摘要:

我们证明,基于秩大于 2 的张量的引力场方程存在自洽性问题,即解中的积分常数(如 Schwarzschild 度规中的参数 $m$)无法在该理论中通过守恒量加以解释。最近提出的共形 Killing 引力是广义相对论的一个有趣扩展,它继承了后者的所有解,但其定义基于一个秩为 3 的张量场方程,且该方程并非由微分同胚不变的作用量导出,因此深受此问题困扰。在该理论中,如何为黑洞解定义能量和角动量,或如何在弱场极限下为致密源发射的引力波定义类似公式(如四极矩公式)的对应物,完全不清楚。

英文摘要:

We show that gravity field equations based on a tensor with rank greater than 2 have consistency problems in the sense that integration constants in the solutions, such as the parameter $m$ in the Schwarzschild metric, do not allow for an interpretation in terms of conserved quantities in the theory. The recently introduced Conformal Killing Gravity, an interesting extension of General Relativity that inherits all the solutions of the latter, and defined with a rank-3 tensor field equation that does not arise from a diffeomorphism-invariant action, is plagued with this problem. In this theory, it is not clear at all how one can define the energy and angular momentum for black hole solutions, or define the analogues of the formulas, such as the quadrupole formula, in the weak field limit for gravitational waves emitted by compact sources.

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