Gravitational lensing and f (R) theories in the Palatini approach |
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Authors: | Matteo Luca Ruggiero |
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Affiliation: | (1) Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;(2) INFN, Sezione di Torino, Turin, Italy |
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Abstract: | We investigate gravitational lensing in the Palatini approach to the f (R) extended theories of gravity. Starting from an exact solution of the f (R) field equations, which corresponds to the Schwarzschild–de Sitter metric and, on the basis of recent studies on this metric, we focus on some lensing observables, in order to evaluate the effects of the nonlinearity of the gravity Lagrangian. We give estimates for some astrophysical events, and show that these effects are tiny for galactic lenses, but become interesting for extragalactic ones. |
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Keywords: | Gravitational lensing Extended theories of gravity |
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