Breaking and restoring of diffeomorphism symmetry in discrete gravity

Details Breaking and restoring of diffeomorphism symmetry in discrete gravity Breaking and restoring of diffeomorphism symmetry in discrete gravity

2009-09-30

arxiv.org/abs/0909.5688v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

to appear in the Proceedings of the XXV Max Born Symposium "The Planck Scale", Wroclaw, 29 June - 3 July, 2009

Scientific paper

We discuss the fate of diffeomorphism symmetry in discrete gravity. Diffeomorphism symmetry is typically broken by the discretization. This has repercussions for the observable content and the canonical formulation of the theory. It might however be possible to construct discrete actions, so--called perfect actions, with exact symmetries and we will review first steps towards this end.

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