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arXiv 0906.4558hep-th
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引力瞬子、自对偶性和几何流

Gravitational instantons, self-duality and geometric flows

F. Bourliot, J. Estes, P. M. Petropoulos, Ph. Spindel

摘要:

我们讨论四维“空间均匀”的引力瞬子。这些是具有潜在非零宇宙学常数的欧几里得真空爱因斯坦方程的自对偶解。它们被赋予一个产品结构R \times M_3导致自然的叶状成三维子空间演变在欧几里得时间。对于一个大类的三维子空间,动力学与三维均匀切片上的几何流一致,由Ricci张量加上so(3)规范连接驱动。三维空间上的度规与三维子空间的vielbein有关,而规范场则继承自四维Levi-Civita联络的反自对偶分量。

英文摘要:

We discuss four-dimensional "spatially homogeneous" gravitational instantons. These are self-dual solutions of Euclidean vacuum Einstein's equations with potentially non-vanishing cosmological constant. They are endowed with a product structure R \times M_3 leading to a natural foliation into three-dimensional subspaces evolving in Euclidean time. For a large class of three-dimensional subspaces, the dynamics coincides with the geometric flow on the three-dimensional homogeneous slice, driven by the Ricci tensor plus an so(3) gauge connection. The metric on the three-dimensional space is related to the vielbein of the three-dimensional subspace, while the gauge field is inherited from the anti-self-dual component of the four-dimensional Levi--Civita connection.

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