Projects per year

### Abstract

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.

Original language | English |
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Pages (from-to) | 268-277 |

Number of pages | 10 |

Journal | Journal of Experimental and Theoretical Physics |

Volume | 125 |

Issue number | 2 |

DOIs | |

Publication status | Published - 1 Aug 2017 |

MoE publication type | A1 Journal article-refereed |

### Keywords

- Nuclei
- Particles
- Fields
- Gravitation
- Astrophysics

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## Projects

## TOPVAC: From Topological Matter to Relativistic Quantum Vacuum

Volovik, G., Nissinen, J., Eltsov, V., Zhang, K., Rysti, J., Volard, M., Laurila, S. & Rantanen, R.

01/10/2016 → 31/12/2021

Project: EU: ERC grants

## Centre of Excellence in Low Temperature Quantum Phenomena and Devices

Eltsov, V., Volovik, G., Hietala, N., Mäkinen, J. & Rysti, J.

01/01/2015 → 31/01/2018

Project: Academy of Finland: Other research funding

## Cite this

*Journal of Experimental and Theoretical Physics*,

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