You need not be afraid of phantom energy

Details You need not be afraid of phantom energy You need not be afraid of phantom energy

2003-05-29

arxiv.org/abs/astro-ph/0305559v1

Phys.Rev. D68 (2003) 021303

Astronomy and Astrophysics

Astrophysics

4 pages, RevTex, to appear as a Rapid Communication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.68.021303

Phantom energy which violates the dominant-energy condition and is not excluded by current constraints on the equation of state may be dominating the evolution of the universe now. It has been pointed out that in such a case the fate of the universe may be a big rid where the expansion is so violent that all galaxies, planet and even atomic nuclei will be successively ripped apart in finite time. Here we show however that there are certain unified models for dark energy which are stable to perturbations in matter density where the presence of phantom energy does not lead to such a cosmic doomsday.

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