Interacting holographic dark energy

Abstract

We demonstrate that a transition from decelerated to accelerated cosmic expansion arises as a pure interaction phenomenon if pressureless dark matter is coupled to holographic dark energy whose infrared cutoff scale is set by the Hubble length. In a spatially flat universe the ratio of the energy densities of both components remains constant through this transition, while it is subject to slow variations for non-zero spatial curvature. The coincidence problem is dynamized and reformulated in terms of the interaction rate. An early matter era is recovered since for negligible interaction at high redshifts the dark energy itself behaves as matter. A simple model for this dynamics is shown to fit the SN Ia data. The constant background energy density ratio simplifies the perturbation analysis which is characterized by non-adiabatic features.

27 pages, two figures, enlarged and revised version, section on perturbations added, accepted for publication in Class.Quantum Grav

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Cited by in corpus (9)

• Le Chatelier-Braun principle in cosmological physics
• Toward a solution of the coincidence problem
• Interacting holographic dark energy in Brans-Dicke theory
• Dynamics of Interacting Quintessence Models: Observational Constraints
• Interacting Dark Energy with Inhomogeneous Equation of State
• Modified Holographic Dark Energy
• Reconstructing the interaction rate in holographic models of dark energy
• Holographic dark energy interacting with dark matter in a Closed Universe
• A quantitative criteria for the coincidence problem