Selftuning vacuum variable and cosmological constant
Abstract
A spacetimeindependent variable is introduced which characterizes a Lorentzinvariant selfsustained quantum vacuum. For a perfect (Lorentzinvariant) quantum vacuum, the selftuning of this variable nullifies the effective energy density which enters the lowenergy 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).
 Publication:

Physical Review D
 Pub Date:
 April 2008
 DOI:
 10.1103/PhysRevD.77.085015
 arXiv:
 arXiv:0711.3170
 Bibcode:
 2008PhRvD..77h5015K
 Keywords:

 11.30.Cp;
 04.20.Cv;
 95.36.+x;
 98.80.Jk;
 Lorentz and Poincare invariance;
 Fundamental problems and general formalism;
 Dark energy;
 Mathematical and relativistic aspects of cosmology;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 28 pages with revtex4