Phantom Dark Energy, Cosmic Doomsday, and the Coincidence Problem

Details Phantom Dark Energy, Cosmic Doomsday, and the Coincidence Problem Phantom Dark Energy, Cosmic Doomsday, and the Coincidence Problem

2004-10-21

arxiv.org/abs/astro-ph/0410508v3

Phys.Rev. D71 (2005) 063519

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, more references and discussion added, to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.71.063519

Phantom dark energy models, with w < -1, are characterized by a future singularity and therefore a finite lifetime for the universe. Because the future singularity is triggered by the onset of dark-energy domination, the universe spends a significant fraction of its total lifetime in a state for which the dark energy and matter densities are roughly comparable. We calculate, as a function of w, the fraction of the total lifetime of the universe for which the dark energy and matter densities differ by less than the ratio r_0 in either direction. For r_0 = 10, this fraction varies from 1/3 to 1/8 as w varies from -1.5 to -1.1; the fraction is smaller for smaller values of r_0. This result indicates that the coincidence problem is significantly ameliorated in phantom-dominated cosmologies with a future singularity.

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