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arXiv 1004.3769hep-th
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关于规范不变性和第一类约束的注记

Remarks on Gauge Invariance and First-Class Constraints

Marc Henneaux, Axel Kleinschmidt, Gustavo Lucena Gómez

摘要:

规范对称性导致第一类约束。这个断言当然只对非平凡的规范对称性成立,即,规范对称性对壳层动力学变量的非平凡作用。我们说明了这一备受赞赏的事实,时间reparametrization不变性的背景下修改的重力-霍拉瓦建议在最近的建议,其中的哈密顿约束变形的任意空间同形不变的条款,其中一些微妙的发现出现。

英文摘要:

Gauge symmetries lead to first-class constraints. This assertion is of course true only for non trivial gauge symmetries, i.e., gauge symmetries that act non trivially on-shell on the dynamical variables. We illustrate this well-appreciated fact for time reparametrization invariance in the context of modifications of gravity -suggested in a recent proposal by Horava-in which the Hamiltonian constraint is deformed by arbitrary spatial diffeomorphism invariant terms, where some subtleties are found to arise.

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