Review on Dark Energy Problem and Modified Gravity Theories
Abstract
We review the issue of dark energy, namely, the late-time cosmic acceleration. There are two representative
approaches to resolve it. One is to introduce an unknown energy component, the so-called dark energy.
The other is to consider the modification of the gravity theory, i.e., general relativity, on large scales. In
addition, we shortly mention our recent related work of an autonomous system analysis for homogeneous
and anisotropic Bianchi-I spacetimes in f (R) gravity. It is shown that only for the case of R2, there exists a
stable de Sitter solution (the solution of the Starobinsky inflation).
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