Dynamical vacuum energy via adjustment mechanism

Abstract

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.

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

References in corpus (7)

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• Dynamics of dark energy
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• Inhomogeneous Gravity
• Is the evidence for dark energy secure?
• "Graceful" Old Inflation
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Cited by in corpus (10)

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• Dark Energy in Practice
• Dark energy: investigation and modeling
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• A Graceful Exit for the Cosmological Constant Damping Scenario
• On the Origin of Gauge Symmetries and Fundamental Constants
• The Newton constant and gravitational waves in some vector field adjusting mechanisms
• The existence of smooth solutions in q-theories
• Robustness of the Cosmological Constant Damping Mechanism Through Matter Eras
• The quintessence field as a perfect cosmic fluid of constant pressure