Covariant entropy conjecture and concordance cosmological models

Details Covariant entropy conjecture and concordance cosmological models Covariant entropy conjecture and concordance cosmological models

2007-12-24

arxiv.org/abs/0712.3821v2

JCAP0810:020,2008

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, 1 figure, JHEP style, references added, published version

Scientific paper

10.1088/1475-7516/2008/10/020

Recently a covariant entropy conjecture has been proposed for dynamical horizons. We apply this conjecture to concordance cosmological models, namely, those cosmological models filled with perfect fluids, in the presence of a positive cosmological constant. As a result, we find this conjecture has a severe constraint power. Not only does this conjecture rule out those cosmological models disfavored by the anthropic principle, but also it imposes an upper bound $10^{-60}$ on the cosmological constant for our own universe, which thus provides an alternative macroscopic perspective for understanding the long-standing cosmological constant problem.

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