# Relaxation of vacuum energy in q-theory

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**Relaxation of vacuum energy in q-theory.** / Klinkhamer, F. R.; Savelainen, M.; Volovik, G. E.

Research output: Contribution to journal › Article › Scientific › peer-review

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*Journal of Experimental and Theoretical Physics*, vol. 125, no. 2, pp. 268-277. https://doi.org/10.1134/S1063776117080052

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*Journal of Experimental and Theoretical Physics*,

*125*(2), 268-277. https://doi.org/10.1134/S1063776117080052

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TY - JOUR

T1 - Relaxation of vacuum energy in q-theory

AU - Klinkhamer, F. R.

AU - Savelainen, M.

AU - Volovik, G. E.

N1 - | openaire: EC/H2020/694248/EU//TOPVAC

PY - 2017/8/1

Y1 - 2017/8/1

N2 - The q-theory formalism aims to describe the thermodynamics and dynamics of the deep quantum vacuum. The thermodynamics leads to an exact cancellation of the quantum-field zero-point-energies in equilibrium, which partly solves the main cosmological constant problem. But, with reversible dynamics, the spatially flat Friedmann–Robertson–Walker universe asymptotically approaches the Minkowski vacuum only if the Big Bang already started out in an initial equilibrium state. Here, we extend q-theory by introducing dissipation from irreversible processes. Neglecting the possible instability of a de-Sitter vacuum, we obtain different scenarios with either a de-Sitter asymptote or collapse to a final singularity. The Minkowski asymptote still requires fine-tuning of the initial conditions. This suggests that, within the q-theory approach, the decay of the de-Sitter vacuum is a necessary condition for the dynamical solution of the cosmological constant problem.

AB - The q-theory formalism aims to describe the thermodynamics and dynamics of the deep quantum vacuum. The thermodynamics leads to an exact cancellation of the quantum-field zero-point-energies in equilibrium, which partly solves the main cosmological constant problem. But, with reversible dynamics, the spatially flat Friedmann–Robertson–Walker universe asymptotically approaches the Minkowski vacuum only if the Big Bang already started out in an initial equilibrium state. Here, we extend q-theory by introducing dissipation from irreversible processes. Neglecting the possible instability of a de-Sitter vacuum, we obtain different scenarios with either a de-Sitter asymptote or collapse to a final singularity. The Minkowski asymptote still requires fine-tuning of the initial conditions. This suggests that, within the q-theory approach, the decay of the de-Sitter vacuum is a necessary condition for the dynamical solution of the cosmological constant problem.

KW - Nuclei

KW - Particles

KW - Fields

KW - Gravitation

KW - Astrophysics

UR - http://www.scopus.com/inward/record.url?scp=85029625867&partnerID=8YFLogxK

U2 - 10.1134/S1063776117080052

DO - 10.1134/S1063776117080052

M3 - Article

VL - 125

SP - 268

EP - 277

JO - Journal of Experimental and Theoretical Physics

JF - Journal of Experimental and Theoretical Physics

SN - 1063-7761

IS - 2

ER -

ID: 15678866