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The interior spacetimes of stars in Palatini f(R) gravity

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arxiv gr-qc/0611132 v3 pith:XUULXDV4 submitted 2006-11-25 gr-qc astro-ph

classification gr-qcastro-ph
keywords interiorgeneralgravitymasspalatinipartialsolutionspacetimes
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abstract

We study the interior spacetimes of stars in the Palatini formalism of f(R) gravity and derive a generalized Tolman-Oppenheimer-Volkoff and mass equation for a static, spherically symmetric star. We show that matching the interior solution with the exterior Schwarzschild-De Sitter solution in general gives a relation between the gravitational mass and the density profile of a star, which is different from the one in General Relativity. These modifications become neglible in models for which $\delta F(R) \equiv \partial f/\partial R - 1$ is a decreasing function of R however. As a result, both Solar System constraints and stellar dynamics are perfectly consistent with $f(R) = R - \mu^4/R$.

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  1. Cosmological phase space of generalized hybrid metric-Palatini theories of gravity

    gr-qc 2019-08 conditional novelty 6.0 of 10

    A dynamical-systems analysis of f(R,ℛ) hybrid metric-Palatini gravity shows no global attractors in the cosmological phase space and only two classes of fixed-point scale factors, one of which predicts a jerk paramete...

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