Regular Seminar Franz Ciceri (AEI Potsdam)
at: 15:00 room G O Jones 610  abstract: Supersymmetric extensions of conformal gravity have been known for a long time. In four dimensions, N=4 conformal supergravity is the maximally supersymmetric theory of this type. Although its field representation and the nonlinear transformations rules were derived more than 30 years ago, no invariant action had been constructed so far. We present the most general class of actions which turns out to be characterised by a holomorphic function. This deviates from the nonmaximally supersymmetric cases where the action is unique. Meanwhile, elaborate loop computations have indicated that N=4 Poincare supergravity diverges at four loops, and the divergence is believed to be related to the presence of a potential oneloop anomaly in the duality symmetry of the theory. We argue that one of the constructed conformal actions, after gauge fixing the conformal symmetries and carefully eliminating auxiliary fields, can be used as a finite supersymmetric counterterm that cancels the anomalous contribution of the oneloop graphs in the Poincare theory. 
Regular Seminar Emil Martinec (Chicago)
at: 14:00 room H503  abstract: The microstate structure of AdS3 black holes involves stringy ingredients, yet quantitative control over these ingredients in a regime where the state being described approximates a black hole has been elusive. This talk will show how 2d worldsheet current algebra provides a tool to describe the stringy objects that govern the black hole phase transition in AdS3 and linear dilaton backgrounds, providing a bridge between the entropycarrying degrees of freedom of the dual nongravitational theory (little strings or long strings) and their conjectured gravitational dual, the fuzzball. 
20190520  20190522 at TRINITY COLLEGE DUBLIN
description: The study of gauge theory and conformal field theory have lead to remarkable advancements in theoretical physics. The first Hamilton school on Mathematical Physics will be held at Trinity College Dublin, Ireland, from the 20th to the 22nd of May, and will focus on modern advancements in gauge theory and conformal field theory, with a particular eye towards providing an interdisciplinary treatment of different subfields in these topics.
