Statut Confirmé Série RENC-THEO Domaines hep-th Date Jeudi 12 Mai 2016 Heure 10:00 Institut IHP Salle Amphi Darboux Nom de l'orateur Hohenegger Prenom de l'orateur Stefan Addresse email de l'orateur Institution de l'orateur IPN Lyon Titre M-strings and Little Strings Résumé I study BPS excitations in M5-M2-brane configurations with a compact transverse direction, which are also relevant for type IIa and IIb little string theories. These configurations are dual to a class of toric elliptically fibered Calabi-Yau manifolds $X_N$ with manifest $SL(2,\mathbb{Z})\times SL(2,\mathbb{Z})$ modular symmetry. They admit two dual gauge theory descriptions. For both, the non-perturbative partition function can be written as an expansion of the topological string partition function of $X_N$ with respect to either of the two modular parameters. I analyse the resulting BPS counting functions in detail and unravel a number of remarkable relations. In particular, I find that for certain M2-brane configurations, the free energies in the two dual theories agree with each other. This points to a new correspondence between instanton and monopole configurations and is also a manifestation of T-duality between type IIa and IIb little string theories. Finally, I briefly comment on a generalisation of these results to orbifolds of little string theories. Numéro de preprint arXiv Commentaires Fichiers attachés

Pour obtenir l' affiche de ce séminaire : [ Postscript | PDF ]

 [ Annonces ]    [ Abonnements ]    [ Archive ]    [ Aide ]    [ JavaScript requis ] [ English version ]