Breaking and Restoring of Diffeomorphism Symmetry in Discrete Gravity

Breaking and Restoring of Diffeomorphism Symmetry in Discrete Gravity
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离散引力中微分同胚对称性的破缺与恢复

DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Bianca Dittrich
Bianca Dittrich
中科院分区：
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文献类型：
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作者：
Benjamin Bahr;Bianca Dittrich

文献摘要

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我们讨论了离散引力中微分同胚对称性的命运。离散化通常会破坏微分同态对称性。这对可观察到的内容和理论的规范表述产生了影响。然而，有可能构造具有精确对称性的离散动作，即所谓的完美动作，我们将回顾朝着这一目标迈出的第一步。
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.