Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-th
Date Vendredi 10 Décembre 2021
Heure 11:00
Institut CPHT
Salle Louis Michel
Nom de l'orateur Grieninger
Prenom de l'orateur Sebastian
Addresse email de l'orateur
Institution de l'orateur IFT Madrid
Titre (Pseudo)-Spontaneous U(1) Symmetry Breaking in Hydrodynamics and Holography
Résumé We investigate the low-energy dynamics of systems with (pseudo)-spontaneously broken U(1) symmetry. First, we consider the purely spontaneous case which corresponds to a superfluid where we compute the support of the hydrodynamic modes on the different field theory operators across the phase diagram. In the pseudo-spontaneous case, we construct a hydrodynamic framework and consider two generalizations of the standard holographic superfluid model to incorporate explicit breaking. In all cases, we find agreement between hydrodynamics and holography. Furthermore, we verify that phase relaxation arises only due to the breaking of the inherent Goldstone shift symmetry. The interplay of a weak explicit breaking of the U(1) and phase relaxation renders the DC electric conductivity finite but does not result in a Drude-like peak. In this scenario we show the validity of a universal relation between the phase relaxation rate, the mass of the pseudo-Goldstone and the Goldstone diffusivity.
Numéro de preprint arXiv 2111.10305
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