Review on Dark Energy Problem and Modified Gravity Theories
Kazuharu Bamba
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 R 2 , there exists a stable de Sitter solution (the solution of the Starobinsky inflation).
Topics & Concepts
Dark energyPhysicsInflation (cosmology)Theoretical physicsGeneral relativityAccelerationHomogeneousDe Sitter universeCosmologyWork (physics)Classical mechanicsCOSMIC cancer databasef(R) gravityDark fluidMathematical physicsUniverseAstrophysicsQuantum gravityStatistical physicsQuantum mechanicsQuantumCosmology and Gravitation TheoriesBlack Holes and Theoretical PhysicsRelativity and Gravitational Theory