Unified description of dark energy and dark matter within the generalized hybrid metric-palatini theory of gravity
Paulo M. Sá
Abstract
The generalized hybrid metric-Palatini theory of gravity admits a scalar-tensor representation in terms of two interacting scalar fields. We show that, upon an appropriate choice of the interaction potential, one of the scalar fields behaves like dark energy, inducing a late-time accelerated expansion of the universe, while the other scalar field behaves like pressureless dark matter that, together with ordinary baryonic matter, dominates the intermediate phases of cosmic evolution. This unified description of dark energy and dark matter gives rise to viable cosmological solutions, which reproduce the main features of the evolution of the universe.
Topics & Concepts
PhysicsDark energyScalar field dark matterDark fluidCold dark matterLambda-CDM modelDark matterScalar fieldTheoretical physicsf(R) gravityMetric expansion of spaceAstrophysicsMathematical physicsCosmologyQuantum gravityQuantum mechanicsQuantumCosmology and Gravitation TheoriesGeophysics and Gravity MeasurementsBlack Holes and Theoretical Physics