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- W2024379875 abstract "We explore the possibility of testing modified gravity exhibiting the Vainshtein mechanism against observations of cluster lensing. We work in the most general scalar-tensor theory with second-order field equations (Horndeski's theory), and derive static and spherically symmetric solutions, for which the scalar field is screened below a certain radius. It is found that the essential structure of the problem in the most general case can be captured by the program of classifying Vainshtein solutions out of different solutions to a quintic equation, as has been performed in the context of massive gravity. The key effect on gravitational lensing is that the second derivative of the scalar field can substantially be large at the transition from screened to unscreened regions, leaving a dip in the convergence. This allows us to put observational constraints on parameters characterizing the general scalar-tensor modification of gravity. We demonstrate how this occurs in massive gravity as an example, and discuss its observational signatures in cluster lensing." @default.
- W2024379875 created "2016-06-24" @default.
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- W2024379875 date "2013-06-10" @default.
- W2024379875 modified "2023-10-02" @default.
- W2024379875 title "Testing general scalar-tensor gravity and massive gravity with cluster lensing" @default.
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- W2024379875 doi "https://doi.org/10.1103/physrevd.87.124006" @default.
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