Everpresent Lambda

Details Everpresent Lambda Everpresent Lambda

2002-09-13

arxiv.org/abs/astro-ph/0209274v1

Phys.Rev.D69:103523,2004

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures, LaTeX

Scientific paper

10.1103/PhysRevD.69.103523

A variety of observations indicate that the universe is dominated by dark energy with negative pressure, one possibility for which is a cosmological constant. If the dark energy is a cosmological constant, a fundamental question is: Why has it become relevant at so late an epoch, making today the only time in the history of the universe at which the cosmological constant is of order the ambient density. We explore an answer to this question drawing on ideas from unimodular gravity, which predicts fluctuations in the cosmological constant, and causal set theory, which predicts the magnitude of these fluctuations. The resulting ansatz yields a fluctuating cosmological ``constant'' which is always of order the ambient density.

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