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2.2.4 Gauge transformations and their properties -- 2.2.5 Differential conservation laws -- 2.2.6 Different variants of the field-theoretical formulation in general relativity -- 2.2.7 The background as an auxiliary structure -- 2.3 Metric perturbations as compensating fields --…
By focusing on the mostly used variational methods, this monograph aspires to give a unified description and comparison of various ways of constructing conserved quantities for perturbations and to study symmetries in general relativity and modified theories of gravity. The main…