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Gravity with more or less gauging
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DOI：10.1088/1361-6382/aadbd1.png)
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摘要
En 中文
General relativity is usually formulated as a theory with gauge invariance under the diffeomorphism group, but there is a 'dilaton' formulation where it is in addition invariant under Weyl transformations, and a 'unimodular' formulation where it is only invariant under the smaller group of special diffeomorphisms. Other formulations with the same number of gauge generators, but a different gauge algebra, also exist. These different formulations provide examples of what we call 'inessential gauge invariance', 'symmetry trading' and 'linking theories'; they are locally equivalent, but may differ when global properties of the solutions are considered. We discuss these notions in the Lagrangian and Hamiltonian formalism.
Keyword:
Weyl invariance
dilaton gravity
unimodular gravity
quantum gravity
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期刊
IF:
3.7
论文数:
1.3W
被引数:
3.0W
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