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arXiv 1212.3000hep-thgr-qcmath-phmath.MP
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突现引力中时空的拓扑变化与时空奇异性的解决

Topology Change of Spacetime and Resolution of Spacetime Singularity in Emergent Gravity

Sunggeun Lee, Raju Roychowdhury, Hyun Seok Yang

摘要:

涌现引力是基于辛几何中的达布定理或莫泽引理,即只要U(1)规范理论定义在具有辛结构的时空上,电磁力总是可以通过局部坐标变换消除。在这种方法中,时空几何由非对易(NC)时空上的U(1)规范场定义。相应地,时空的拓扑由NC U(1)规范场的拓扑决定。我们证明了在突现引力中时空的拓扑变化是充分的,在NC时空中时空奇异性的后续解决是可能的。因此,突现引力方法为时空的拓扑变化提供了一个定义明确的机制,与广义相对论形成鲜明对比的是,这种机制不存在任何时空奇点。

英文摘要:

Emergent gravity is based on the Darboux theorem or the Moser lemma in symplectic geometry stating that the electromagnetic force can always be eliminated by a local coordinate transformation as far as U(1) gauge theory is defined on a spacetime with symplectic structure. In this approach, the spacetime geometry is defined by U(1) gauge fields on noncommutative (NC) spacetime. Accordingly the topology of spacetime is determined by the topology of NC U(1) gauge fields. We show that the topology change of spacetime is ample in emergent gravity and the subsequent resolution of spacetime singularity is possible in NC spacetime. Therefore the emergent gravity approach provides a well-defined mechanism for the topology change of spacetime which does not suffer any spacetime singularity in sharp contrast to general relativity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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