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- W2896416149 abstract "Many models in which Lorentz symmetry is spontaneously broken in a curved spacetime do so via a “Lorentz-violating” (LV) vector or tensor field, which dynamically takes on a vacuum expectation value and provides additional local geometric structure beyond the metric. The kinetic terms of such a field will not necessarily be decoupled from the kinetic terms of the metric, and will generically lead to a set of coupled equations for the perturbations of the metric and the LV field. In some models, however, the imposition of certain additional conditions can decouple these equations, yielding an “effective equation” for the metric perturbations alone. The resulting effective equation may depend on the metric in a gauge-invariant way, or it may be gauge-dependent. The only two known models yielding gauge-invariant effective equations involve differential forms; I show in this work that the obvious generalizations of these models do not yield gauge-invariant effective equations. Meanwhile, I show that a gauge-dependent effective equation may be obtained from any “tensor Klein–Gordon” model under similar assumptions. Finally, I discuss the implications of this work in the search for Lorentz-violating gravitational effects." @default.
- W2896416149 created "2018-10-26" @default.
- W2896416149 creator A5044449288 @default.
- W2896416149 date "2018-10-12" @default.
- W2896416149 modified "2023-09-26" @default.
- W2896416149 title "Lorentz-Violating Gravity Models and the Linearized Limit" @default.
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- W2896416149 doi "https://doi.org/10.3390/sym10100490" @default.
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