Volume 142, Number 6, June 2023
|Number of page(s)||7|
|Section||Gravitation, cosmology and astrophysics|
|Published online||22 June 2023|
Quantum recoherence in the early universe
1 Université Paris-Saclay, CNRS, Institut d'Astrophysique Spatiale - 91405, Orsay, France
2 Laboratoire Astroparticule et Cosmologie, Université Denis Diderot Paris 7 - 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France
3 Laboratoire de Physique de l'Ecole Normale Supérieure, ENS, CNRS, Université PSL, Sorbonne Université, Université Paris Cité - F-75005 Paris, France
(a) E-mail: email@example.com (corresponding author)
Received: 6 April 2023
Accepted: 12 June 2023
Despite being created through a fundamentally quantum-mechanical process, cosmological structures have not yet revealed any sign of genuine quantum correlations. Among the obstructions to the direct detection of quantum signatures in cosmology, environmental-induced decoherence is arguably one of the most inevitable. Yet, we discover a mechanism of quantum recoherence for the adiabatic perturbations when they couple to an entropic sector. After a transient phase of decoherence, a turning point is reached, recoherence proceeds and adiabatic perturbations exhibit a large amount of self-coherence at late-time. This result is also understood by means of a non-Markovian master equation, which reduces to Wilsonian effective-field theory in the unitary limit. This allows us to critically assess the validity of open-quantum-system methods in cosmology and to highlight that re(de)coherence from linear interactions has no flat-space analogue.
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