Self-tuning vacuum variable and cosmological constant

Details Self-tuning vacuum variable and cosmological constant Self-tuning vacuum variable and cosmological constant

2007-11-20

arxiv.org/abs/0711.3170v6

Phys.Rev.D77:085015,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

28 pages with revtex4; v6: preprint version of published paper with detailed references

Scientific paper

10.1103/PhysRevD.77.085015

A spacetime-independent variable is introduced which characterizes a Lorentz-invariant self-sustained quantum vacuum. For a perfect (Lorentz-invariant) quantum vacuum, the self-tuning of this variable nullifies the effective energy density which enters the low-energy gravitational field equations. The observed small but nonzero value of the cosmological constant may then be explained as corresponding to the effective energy density of an imperfect quantum vacuum (perturbed by, e.g., the presence of thermal matter).

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