TY - JOUR

T1 - Self-tuning vacuum variable and cosmological constant

AU - Klinkhamer, F.R.

AU - Volovik, Grigory

PY - 2008

Y1 - 2008

N2 - 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).

AB - 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).

KW - cosmological constant

KW - self-sustained quantum vacuum

KW - cosmological constant

KW - self-sustained quantum vacuum

KW - cosmological constant

KW - self-sustained quantum vacuum

U2 - 10.1103/PhysRevD.77.085015

DO - 10.1103/PhysRevD.77.085015

M3 - Article

VL - 77

SP - 1

EP - 14

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 2470-0010

IS - 8

M1 - 085015

ER -