Dynamical vacuum energy via adjustment mechanism

Details Dynamical vacuum energy via adjustment mechanism Dynamical vacuum energy via adjustment mechanism

2008-01-20

arxiv.org/abs/0801.3090v2

Phys.Rev.D77:083503,2008

Astronomy and Astrophysics

Astrophysics

12 pages, v2 with minor grammatical changes and one reference added. Published in PRD

Scientific paper

10.1103/PhysRevD.77.083503

A new mechanism of adjustment of vacuum energy down to the observed value from an initially huge one is considered. The mechanism is based on a very strong variation of the gravitational coupling constant in very early universe. The model predicts that the non--compensated remnant of vacuum energy changes very slowly at late stages of the cosmological evolution and is naturally close to the observed one. Asymptotically the effective vacuum energy tends to a negative value, so the cosmological expansion should stop and turn into contraction. There remains the problem of introduction of the usual matter into the model and therefore realising realistic cosmology.

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