The Fate of the Accelerating Universe

Details The Fate of the Accelerating Universe The Fate of the Accelerating Universe

2001-06-21

arxiv.org/abs/astro-ph/0106387v2

Phys.Rev. D73 (2006) 023519

Astronomy and Astrophysics

Astrophysics

16 pages, 5 figures, LaTeX

Scientific paper

10.1103/PhysRevD.73.023519

The presently accelerating universe may keep accelerating forever, eventually run into the event horizon problem, and thus be in conflict with the superstring idea. In the other way around, the current accelerating phase as well as the fate of the universe may be swayed by a negative cosmological constant, which dictates a big crunch. Based on the current observational data, in this paper we investigate how large the magnitude of a negative cosmological constant is allowed to be. In addition, for distinguishing the sign of the cosmological constant via observations, we point out that a measure of the evolution of the dark energy equation of state may be a good discriminator. Hopefully future observations will provide much more detailed information about dark energy and thereby indicates the sign of the cosmological constant as well as the fate of the presently accelerating universe.

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