Fate of an accelerating universe | Zendy

Je-An Gu | Zendy; W-Y. P. Hwang | Zendy

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Fate of an accelerating universe

Author(s) -

Je-An Gu,

W-Y. P. Hwang

Publication year - 2006

Publication title -

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Language(s) - English

Resource type - Journals

eISSN - 1550-7998

pISSN - 1550-2368

DOI - 10.1103/physrevd.73.023519

Subject(s) - big crunch , physics , ultimate fate of the universe , cosmological constant , de sitter universe , dark energy , universe , theoretical physics , metric expansion of space , flatness problem , age of the universe , astrophysics , cosmology , physical cosmology , steady state theory

The presently accelerating universe may keep accelerating forever, eventuallyrun into the event horizon problem, and thus be in conflict with thesuperstring idea. In the other way around, the current accelerating phase aswell as the fate of the universe may be swayed by a negative cosmologicalconstant, which dictates a big crunch. Based on the current observational data,in this paper we investigate how large the magnitude of a negative cosmologicalconstant is allowed to be. In addition, for distinguishing the sign of thecosmological constant via observations, we point out that a measure of theevolution of the dark energy equation of state may be a good discriminator.Hopefully future observations will provide much more detailed information aboutdark energy and thereby indicates the sign of the cosmological constant as wellas the fate of the presently accelerating universe.Comment: 16 pages, 5 figures, LaTe

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