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arXiv 2310.02101hep-thgr-qchep-ph
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路径积分因子化与引力有效作用量

Path Integral Factorization and the Gravitational Effective Action

Patrick Draper, Szilard Farkas, Manthos Karydas

AI总结:

针对含黎曼张量高维算符的欧几里得引力路径积分,研究其场的因子化与连续性,构造微正则系综边界项,证明准局域约束下鞍点温度不连续且对部分重场量子修正鲁棒,并用BTZ法验证4维SdS熵与Wald公式结果一致。

摘要:

我们讨论了含由黎曼张量幂次构造的高维算符的欧几里得引力路径积分中场的因子化与连续性性质。我们构造了对应微正则系综的边界项,并证明在准局域能量约束下,路径积分的鞍点近似通常会得到温度不连续的鞍点。这一结果拓展了爱因斯坦引力中欧几里得施瓦西-德西特几何的先前结论,表明该结论至少对部分来自重场的量子修正具有鲁棒性。作为应用,我们使用BTZ方法计算了D=4维下SdS的熵,所得结果与用Wald公式计算的熵一致。

英文摘要:

We discuss the factorization and continuity properties of fields in the Euclidean gravitational path integral with higher dimension operators constructed from powers of the Riemann tensor. We construct the boundary terms corresponding to the microcanonical ensemble and show that the saddle point approximation to the path integral with a quasilocal energy constraint generally yields a saddle point with discontinuous temperature. This extends a previous result for the Euclidean Schwarzschild-de Sitter geometry in Einstein gravity and shows that it is robust against at least some types of quantum corrections from heavy fields. As an application, we compute the entropy of SdS in $\text{D}=4$ using the BTZ method. Our result matches the entropy calculated using Wald's formula.

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