Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-th
Date Jeudi 16 Mai 2019
Heure 14:00
Institut CPHT
Salle Salle de Conférence Jean Lascoux
Nom de l'orateur Monten
Prenom de l'orateur Ruben
Addresse email de l'orateur
Institution de l'orateur IPhT - Saclay
Titre The TTbar deformation and holography
Résumé Two-dimensional quantum fields theories rather universally contain an interesting operator built from the stress tensor, called ``TTbar''. Although this operator is irrelevant, adding it to the action generates a new family of theories in a controlled way. For the particular case of conformal field theories with an Anti-de Sitter holographic dual, it has been proposed that the TTbar-deformed theories correspond to the theories ``living'' on hypersurfaces of fixed radius in AdS. We will use the variational principle in the CFT to derive mixed boundary conditions for the dual metric at large N. This confirms the conjecture for pure gravity and for a particular sign of the deformation parameter, but it requires modification when matter is present. The asymptotic symmetries of the gravitational theory with mixed boundary conditions form two Virasoro algebras, the generators of which are state-dependent but the central charge remains unchanged.
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