Dynamical analysis on f(R, G) cosmology
Abstract
We use a dynamical system approach to study the cosmological viability of f(R, G) gravity theories. The method consists of formulating the evolution equations as an autonomous system of ordinary differential equations, using suitable variables. The formalism is applied to a class of models in which f(R, G)\propto RnG1-n and its solutions and corresponding stability are analysed in detail. New accelerating solutions that can be attractors in the phase space are found. We also find that this class of models does not exhibit a matter-dominated epoch, a solution which is inconsistent with current cosmological observations.
- Publication:
-
Classical and Quantum Gravity
- Pub Date:
- April 2018
- DOI:
- 10.1088/1361-6382/aaad80
- arXiv:
- arXiv:1802.02572
- Bibcode:
- 2018CQGra..35g5013S
- Keywords:
-
- General Relativity and Quantum Cosmology;
- High Energy Physics - Theory
- E-Print:
- 12 pages, 4 figures. Accepted for publication in Classical and Quantum Gravity