Holographic dark energy and cosmic coincidence
General Relativity and Quantum Cosmology
2009-09-29 v3 Astrophysics
High Energy Physics - Theory
Abstract
In this Letter we demonstrate that any interaction of pressureless dark matter with holographic dark energy, whose infrared cutoff is set by the Hubble scale, implies a constant ratio of the energy densities of both components thus solving the coincidence problem. The equation of state parameter is obtained as a function of the interaction strength. For a variable degree of saturation of the holographic bound the energy density ratio becomes time dependent which is compatible with a transition from decelerated to accelerated expansion.
Keywords
Cite
@article{arxiv.gr-qc/0505020,
title = {Holographic dark energy and cosmic coincidence},
author = {Diego Pavon and Winfried Zimdahl},
journal= {arXiv preprint arXiv:gr-qc/0505020},
year = {2009}
}
Comments
9 pages, no figures, references updated, typos eliminated. To be published in Physics Letters B