Statut  Confirmé 
Série  RENCTHEO 
Domaines  hepth 
Date  Jeudi 25 Janvier 2018 
Heure  11:45 
Institut  LPTHE 
Salle  IMPMC, salle 401, tour 2223, 4eme étage 
Nom de l'orateur  Tourkine 
Prenom de l'orateur  Piotr 
Addresse email de l'orateur  piotr [dot] tourkine [at] cern [dot] ch 
Institution de l'orateur  CERN 
Titre  New duality symmetric theories from twisted strings 
Résumé  Twistor strings have undergone a renewal of interest since the discovery of the CachazoHe Yuan formalism for scattering amplitude in field theory in 2013. These formulae deeply challenge the way we think about scattering amplitudes in quantum field theory and are neatly explained by the socalled ambitwistor string, a cousin of the old twistor string. The existence of these remarkable formalisms, which I shall present during the talk, cried for a connection to good old string theory. The answer to this question is now understood: it relies on counterintuitive limits and crucially, the existence of a different quantization for string theory, which we called twisted strings. The first part of the talk will be concerned on making that connection to string theory clear. In the second part, I will report on recent results obtained with Eduardo Casali on the winding modes of these twisted strings. They give rise to new exotic target space theories, naively non unitary, but exhibiting features half way between string and field theory. In particular, they are Tduality symmetric. 
Numéro de preprint arXiv  
Commentaires  Beware, unusual location ! 
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