Holographic dark energy and cosmic coincidence

Details Holographic dark energy and cosmic coincidence Holographic dark energy and cosmic coincidence

2005-05-04

arxiv.org/abs/gr-qc/0505020v3

Phys.Lett.B628:206-210,2005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, no figures, references updated, typos eliminated. To be published in Physics Letters B

Scientific paper

10.1016/j.physletb.2005.08.134

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.

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