f(R) cosmology by Noether's symmetry

Details f(R) cosmology by Noether's symmetry f(R) cosmology by Noether's symmetry

2008-04-14

arxiv.org/abs/0804.2163v3

JCAP 0808:016,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

23 pages, uses RevTeX

Scientific paper

10.1088/1475-7516/2008/08/016

A general approach to find out exact cosmological solutions in f(R)-gravity is discussed. Instead of taking into account phenomenological models, we assume, as a physical criterium, the existence of Noether symmetries in the cosmological f(R) Lagrangian. As a result, the presence of such symmetries selects viable models and allow to solve the equations of motion. We discuss also the case in which no Noether charge is present but general criteria can be used to achieve solutions.

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