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- W3100532647 abstract "We study cosmic structures in the quadratic Degenerate Higher Order Scalar Tensor (qDHOST) model, which has been proposed as the most general scalar-tensor theory (up to quadratic dependence on the covariant derivatives of the scalar field), which is not plagued by the presence of ghost instabilities. We then study a static, spherically symmetric object embedded in de Sitter space-time for the qDHOST model. This model exhibits breaking of the Vainshtein mechanism inside the cosmic structure and Schwarzschild-de Sitter space-time outside, where General Relativity (GR) can be recovered within the Vainshtein radius. We constrained the parameters of the qDHOST model by requiring the validity of the Vainshtein screening mechanism inside the cosmic structures and the consistency with the recently established bounds on gravitational wave speed from GW170817/GRB170817A event. We find that these two constraints rule out the same set of parameters, corresponding to the Lagrangians that are quadratic in second-order derivatives of the scalar field, for the shift symmetric qDHOST." @default.
- W3100532647 created "2020-11-23" @default.
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- W3100532647 date "2018-05-17" @default.
- W3100532647 modified "2023-09-24" @default.
- W3100532647 title "Cosmic structures and gravitational waves in ghost-free scalar-tensor theories of gravity" @default.
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- W3100532647 doi "https://doi.org/10.1088/1475-7516/2018/05/048" @default.
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