Statut  Confirmé 
Série  SEMCPHT 
Domaines  hepth 
Date  Mardi 15 Janvier 2019 
Heure  15:00 
Institut  CPHT 
Salle  Salle de Conference Louis Michel (Bât.6 CPHT) 
Nom de l'orateur  Sulejmanpasic 
Prenom de l'orateur  Tin 
Addresse email de l'orateur  
Institution de l'orateur  ENS 
Titre  Nonlinear sigma models in 2d, thetaterms, anomaly matching and lattice field theory 
Résumé  I will discuss bosonic nonlinear sigma models in 2d, specifically focusing on the CP(N1) and flagmanifold target space. These models allow thetaterms. I will show that interesting anomaly matching conditions exist for these models at specific values of theta, allowing rigorous predictions about the phasediagram of the models. If time permits, I will also discuss numerical studies of such systems. The thetaterm typically introduces the complexaction problem, prohibiting Monte Carlo simulations from firstprinciples. This complexaction problem can be overcome however by proper reformulation of the theory on the lattice, and subsequent dualization. The approach leads to some beautiful results in higher dimensions as well, such as natural definition of magnetically charged matter and Kramers–Wannier duality in 4d. 
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