Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines cond-mat.stat-mech
Date Mercredi 1 Décembre 2021
Heure 14:30
Institut LPENS
Salle L367
Nom de l'orateur Pappalardi
Prenom de l'orateur Silvia
Addresse email de l'orateur
Institution de l'orateur LPENS
Titre Quantum bounds and fluctuation-dissipation theorem
Résumé In recent years, there has been intense attention on the constraints posed by quantum mechanics on the dynamics of the correlation at low temperatures, triggered by the postulation and derivation of quantum bounds on the transport coefficients or the chaos rate. However, the physical meaning and the mechanism enforcing such bounds is still an open question. In this talk, I will discuss the quantum fluctuation-dissipation theorem (the KMS conditions) in relation to the bounds on correlation time scales. First of all, I will map out-of-time correlation functions onto ordered two-point functions in a replicated space. This allows for a simple derivation of the quantum bound to chaos as a direct consequence of the KMS condition. Secondly, I will describe how quantum fluctuation-dissipation relations act in general as a blurring of the time-dependence of correlations, which can imply bounds on their decay rates. Thinking in terms of fluctuation-dissipation opens a direct connection between bounds and other thermodynamic properties.
Numéro de preprint arXiv 2110.03497
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