Constraining f(R) theories with the energy conditions

Details Constraining f(R) theories with the energy conditions Constraining f(R) theories with the energy conditions

2006-08-15

arxiv.org/abs/gr-qc/0608072v1

Phys.Lett. B642 (2006) 311-314

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 3 figures

Scientific paper

10.1016/j.physletb.2006.10.003

A new method to constrain gravitational theories depending on the Ricci scalar is presented. It is based on the weak energy condition and yields limits on the parameters of a given theory through the current values of the derivatives of the scale factor of the Friedmann-Robertson-Walker geometry. A further constraint depending on the current value of the snap is also given. Actual constraints (and the corresponding error propagation analysis) are calculated for two examples, which show that the method is useful in limiting the possible $f(R)$ theories.

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