An Efficient Representation of Euclidean Gravity I

Details An Efficient Representation of Euclidean Gravity I An Efficient Representation of Euclidean Gravity I

2011-09-29

arxiv.org/abs/1109.6644v2

JHEP 1112:025,2011

Physics

High Energy Physics

High Energy Physics - Theory

31 pages, 1 figure

Scientific paper

10.1007/JHEP12(2011)025

We explore how the topology of spacetime fabric is encoded into the local structure of Riemannian metrics using the gauge theory formulation of Euclidean gravity. In part I, we provide a rigorous mathematical foundation to prove that a general Einstein manifold arises as the sum of SU(2)_L Yang-Mills instantons and SU(2)_R anti-instantons where SU(2)_L and SU(2)_R are normal subgroups of the four-dimensional Lorentz group Spin(4) = SU(2)_L x SU(2)_R. Our proof relies only on the general properties in four dimensions: The Lorentz group Spin(4) is isomorphic to SU(2)_L x SU(2)_R and the six-dimensional vector space of two-forms splits canonically into the sum of three-dimensional vector spaces of self-dual and anti-self-dual two-forms. Consolidating these two, it turns out that the splitting of Spin(4) is deeply correlated with the decomposition of two-forms on four-manifold which occupies a central position in the theory of four-manifolds.

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