Energy conditions in f(R) gravity

By J. Santos, J. Alcaniz, M. Rebouças, F. Carvalho. 2007

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In order to shed some light on the current discussion about f(R)-gravity theories we derive and discuss the bounds imposed by the energy conditions on a general f(R) functional form. The null and strong energy conditions in this framework are derived from Raychaudhuri's equation along with the requirement that gravity is attractive, whereas the weak and dominant energy conditions are stated from a comparison with the energy conditions that can be obtained in a direct approach via an effective energy-momentum tensor for f(R) gravity. As a concrete application of the energy conditions to locally homogeneous and isotropic f(R) cosmology, the recent estimated values of the deceleration and jerk parameters are used to examine the bounds from the weak energy condition on the parameters of two families of f(R)-gravity theories.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/1e04aca86b156ae35978f0679a5920d29f554dc3

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Citations in the corpus

f(R) Theories Of Gravity (2008, methodology): “15 In (Santos et al., 2007), the Null Energy Condition and the Strong Energy Condition for metric f(R) gravity have been derived by using the Raychaudhuri equation and imposing that gravity be attractive, whereas for the Weak Energy Condition and the Dominant Energy Condition an effective…”