Breaking and restoring of diffeomorphism symmetry in discrete gravity

B. Bahr; B. Dittrich

Breaking and restoring of diffeomorphism symmetry in discrete gravity

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arxiv 0909.5688 v1 pith:BKK3AMJG submitted 2009-09-30 gr-qc hep-lathep-th

B. Bahr , B. Dittrich This is my paper · ORCID

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keywords diffeomorphismdiscretesymmetryactionsgravitybreakingbrokencanonical

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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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