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Article Dans Une Revue EPL Année : 2023

Quantum recoherence in the early universe

Résumé

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.

Dates et versions

hal-03926588 , version 1 (06-01-2023)

Identifiants

Citer

Thomas Colas, Julien Grain, Vincent Vennin. Quantum recoherence in the early universe. EPL, 2023, 142 (6), pp.69002. ⟨10.1209/0295-5075/acdd94⟩. ⟨hal-03926588⟩
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