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- W4280491285 abstract "In this article, we develop the formalism for singular hypersurfaces and junction conditions in generalized coupling theories using a variational approach. We then employ this formalism to examine the behavior of sharp matter density gradients in generalized coupling theories. We find that such gradients do not necessarily lead to the pathologies present in other theories of gravity with auxiliary fields. A detailed example, based on a simple instance of a generalized coupling theory called the MEMe model, is also provided. In the static case, we show that sharp boundaries do not generate singularities in the dynamical frame despite the presence of an auxiliary field. Instead, in the case of a collapsing spherical density distribution with a general profile an additional force compresses over-densities and expands underdensities. These results can also be used to deduce additional constraints on the parameter of this model." @default.
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- W4280491285 date "2022-05-17" @default.
- W4280491285 modified "2023-10-15" @default.
- W4280491285 title "Junction conditions and sharp gradients in generalized coupling theories" @default.
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- W4280491285 doi "https://doi.org/10.1103/physrevd.105.104036" @default.
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