论文标题
重力受约束激体
Gravitational Constrained Instantons
论文作者
论文摘要
我们发现，在有和没有宇宙常数的情况下，爱因斯坦重力受到限制。这些配置不是爱因斯坦 - 希尔伯特作用的鞍点，但它们有助于量子重力的非扰动过程。在某些情况下，我们预计它们会从某些固定拓扑的空间中贡献主导的贡献。这些指标以负宇宙常数的形式描述了连接两个渐近区域的虫洞。我们发现了许多这种虫洞指标的例子，并且对于某些对称配置，我们建立了它们的扰动稳定性。我们预计这些虫洞的欧几里得版本编码了ADS黑洞微杆菌的能级统计数据。在De Sitter和平坦的空间设置中，我们发现了新的同质和各向同性的弹跳以及大爆炸/紧缩宇宙学。
We find constrained instantons in Einstein gravity with and without a cosmological constant. These configurations are not saddle points of the Einstein-Hilbert action, yet they contribute to non-perturbative processes in quantum gravity. In some cases we expect that they give the dominant contribution from spacetimes with certain fixed topologies. With negative cosmological constant, these metrics describe wormholes connecting two asymptotic regions. We find many examples of such wormhole metrics and for certain symmetric configurations establish their perturbative stability. We expect that the Euclidean versions of these wormholes encode the energy level statistics of AdS black hole microstates. In the de Sitter and flat space settings we find new homogeneous and isotropic bounce and big bang/crunch cosmologies.
