Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series STR-LPT-ENS-HE
Subjects hep-th
Date Tuesday 16 January 2018
Time 11:30
Institute LPTENS
Seminar Room LPTENS library
Speaker's Last Name Vegh
Speaker's First Name David
Speaker's Email Address
Speaker's Institution Queen Mary University of London
Title Chaos and integrability: strings in AdS
Abstract In this talk I present three topics. In the first part, I talk about the butterfly effect and the role of out-of-time-order correlators in diagnosing chaos. Maldacena, Shenker, and Stanford discovered a sharp bound on the rate of growth of chaos in thermal quantum systems. This is saturated by black holes in AdS/CFT. I show that (perhaps contrary to some expectations) there are maximally chaotic quantum systems that do not contain gravity. In the second part, I consider integrable string motion and describe a new discrete way of computing the time-evolution. In the third part, I study pair-production of cusps on a string. Initially, the static string stretches between two points on the boundary. Perturbing one of the endpoints creates a large propagating wave. The non-linear time-evolution produces energy cascades which result in the creation of cusps on the string. These correspond to singular solitons in the underlying generalized sinh-Gordon theory.
arXiv Preprint Number

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