Triangle Seminars
Monday, 21 Nov 2016
Tinkertoys for the Exceptional (2,0) Theories
Jacques Distler
(Texas U.)
Abstract:
I'll give an introduction to N=2, D=4 SCFTs of "Class-S" and a survey of our programme for classifying such theories. I will put special emphasis on the theories arising from the Exceptional (2,0) SCFTs in D=6.
I'll give an introduction to N=2, D=4 SCFTs of "Class-S" and a survey of our programme for classifying such theories. I will put special emphasis on the theories arising from the Exceptional (2,0) SCFTs in D=6.
Posted by: IC
Black holes and exotic branes in string theory
Masaki Shigemori
(QMUL)
Abstract:
PhD Lecture 3: Exotic branes: We will see that duality predicts various low-codimension objects called exotic branes, and discuss their peculiar properties.
PhD Lecture 3: Exotic branes: We will see that duality predicts various low-codimension objects called exotic branes, and discuss their peculiar properties.
Posted by: QMW
Tuesday, 22 Nov 2016
Black holes and exotic branes in string theory
Masaki Shigemori
(QMUL)
Abstract:
PhD Lecture 4: Black hole microstates and exotic branes: We will discuss supergravity representations of black hole microstates and the possible role played by exotic branes.
PhD Lecture 4: Black hole microstates and exotic branes: We will discuss supergravity representations of black hole microstates and the possible role played by exotic branes.
Posted by: QMW
Wednesday, 23 Nov 2016
Non-Wilsonian RG flows and the T barT perturbation of 2D quantum field theories
📍 London
Roberto Tateo
(University of Turin)
Abstract:
An interesting link between the effective string theory describing the colour confinement in Yang-Mills theories and conformal field theories perturbed by the composite operator \(T \bar{T}\) was recently discovered. We will discuss various aspects of this special kind of integrable
perturbation and how it affects the energy levels of a generic 2D Quantum Field Theory, through a surprising relation with the inviscid Burgers equation.
As this class of models corresponds to non-Wilsonian RG trajectories, these studies may help to clarify important aspects concerning the appearance of singularities in effective QFT, and hopefully be useful in the effective string framework.
An interesting link between the effective string theory describing the colour confinement in Yang-Mills theories and conformal field theories perturbed by the composite operator \(T \bar{T}\) was recently discovered. We will discuss various aspects of this special kind of integrable
perturbation and how it affects the energy levels of a generic 2D Quantum Field Theory, through a surprising relation with the inviscid Burgers equation.
As this class of models corresponds to non-Wilsonian RG trajectories, these studies may help to clarify important aspects concerning the appearance of singularities in effective QFT, and hopefully be useful in the effective string framework.
Posted by: KCL
SEMINAR CANCELLED
Paul Townsend
(Cambridge)
Abstract:
The N-extended massless superparticle in a 4D Minkowski background has a worldline time-reversal invariance that becomes CPT in the quantum theory. This symmetry is anomalous for odd N, which explains why there is no CPT-self-conjugate massless supermultiplet for N=1. In the
supertwistor formulation of superparticle mechanics, the anomaly is a close cousin of the parity anomaly of 3D gauge theories. CPT is not anomalous if N is even but if 2N is odd there is a Kramers degeneracy, which explains why the N=2 hypermultiplet is a doubled version of the CPT-self-conjugate supermultiplet of helicities (-1/2,0,0,1/2).
The N-extended massless superparticle in a 4D Minkowski background has a worldline time-reversal invariance that becomes CPT in the quantum theory. This symmetry is anomalous for odd N, which explains why there is no CPT-self-conjugate massless supermultiplet for N=1. In the
supertwistor formulation of superparticle mechanics, the anomaly is a close cousin of the parity anomaly of 3D gauge theories. CPT is not anomalous if N is even but if 2N is odd there is a Kramers degeneracy, which explains why the N=2 hypermultiplet is a doubled version of the CPT-self-conjugate supermultiplet of helicities (-1/2,0,0,1/2).
Posted by: IC
Thursday, 24 Nov 2016
S-matrix bootstrap revisited
Joao Penedones
(Lausanne U.)
Abstract:
Inspired by the recent success of the numerical approach to the conformal bootstrap, we revisit the S-matrix bootstrap program. We shall explain how to obtain analytic bounds on the interaction strength in 1+1 QFT. In higher dimensions, we propose a numerical algorithm that seems to converge to optimal bounds.
Inspired by the recent success of the numerical approach to the conformal bootstrap, we revisit the S-matrix bootstrap program. We shall explain how to obtain analytic bounds on the interaction strength in 1+1 QFT. In higher dimensions, we propose a numerical algorithm that seems to converge to optimal bounds.
Posted by: QMW