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Open Quantum Systems Decoherence

Gaussian fluctuations in the tunneling probability of a closed universe

arXiv
Authors: L. Salasnich

Year

2026

Paper ID

63896

Status

Preprint

Abstract Read

~2 min

Abstract Words

97

Citations

0

Abstract

We consider the quantum creation of a closed universe within the Euclidean path-integral formalism. An analytical expression for the tunneling probability is derived, including both the exponential suppression and the exact Gaussian prefactor due to quadratic fluctuations around the instanton. The calculation is performed in a fixed-interval minisuperspace formulation, where the Hamiltonian constraint is imposed at the level of the classical instanton, while the full lapse integration is not included beyond the leading semiclassical approximation. The result provides a transparent and self-consistent semiclassical estimate of the nucleation rate, refining previous analyses with the inclusion of Gaussian fluctuations.

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  • This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
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  • We consider the quantum creation of a closed universe within the Euclidean path-integral formalism.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2605.16150 [2] arXiv https://arxiv.org/abs/2605.16150 [3] Publisher https://arxiv.org/abs/2605.16150

Local Citation Graph (Related-Paper Links)

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External citation index: OpenAlex citation signal • updated 2026-06-15 05:22:45

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