Statut  Confirmé 
Série  SEMCPHT 
Domaines  hepth 
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  Twodimensional 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 Antide Sitter holographic dual, it has been proposed that the TTbardeformed 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 statedependent but the central charge remains unchanged. 
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