Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-th
Date Mercredi 29 Novembre 2017
Heure 11:30
Institut LPTENS
Salle LPTENS library
Nom de l'orateur Teber
Prenom de l'orateur Sofian
Addresse email de l'orateur
Institution de l'orateur LPTHE
Titre Critical behavior of (2+1)-dimensional QED
Résumé The talk will focus on dynamical chiral symmetry breaking (DCSB) in three-dimensional QED with N four-component fermions. The interest in QED3 comes from its similarities to (3+1)-dimensional QCD and the fact that DCSB may be studied systematically in this simpler model. Additionally, QED3 is often used as an effective field theory model describing planar condensed matter physics systems. In this talk, we shall present recent results related to the computation of the critical fermion flavor number, Nc, which is such that DCSB takes place for N < Nc. The method envolves solving the Schwinger-Dyson gap equation in an arbitrary nonlocal gauge up to next-to-leading order in the 1/N-expansion. Our results suggest that DCSB should take place for integer values N smaller or equal to 3. If times allows, a new mapping between QED3 and the so-called reduced QED, describing planar Dirac liquids at the infra-red Lorentz invariant fixed point, will be presented together with new results on dynamical gap generation in these liquids.
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