UEICMSSeminar Room
FIRST seminar
SECOND seminar
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ICMSLecture Theatre (room 5.10)2018-10-03Preseminar for PhD studentsAmihay HananyImperial CollegeDiscrete Gauging in six dimensionsWhen M5 branes are placed in an A type ALE background there are tensionless strings which arise each time 2 or more M5 branes coincide. The system has no low energy Lagrangian description and new techniques need to be applied in order to figure out the relevant physics of such coincident M5 branes. The world volume theory on the M5 branes has (0,1) supersymmetry in 6 dimensions with massless vector, tensor and hyper multiplets. There are two branches on the moduli space of vacuum configurations where scalar fields in tensor and hyper multiplets receive VEVs, respectively. In this talk we will focus on the Higgs branch of the low energy theory and find new and fairly surprising results. Each time there is a new tensionless string, there is a new Higgs branch, thus the theory has a multitude of Higgs branches depending on the types of tensionless strings in the spectrum. There are two main effects: “discrete gauging” and “small instanton transitions” (when one extends beyond A type) and a need to efficiently describe the so many Higgs branches which arise. The main tool is the Coulomb branch of 3d N=4 gauge theories, which has been studied intensively by many of my collaborators.
Bart VlaarHeriot-WattThe reflection equation: history, concepts and solutionsQuantum integrability is typically underpinned by factorizability criteria (say, of a scattering process). Away from boundaries this is the Yang-Baxter equation, a cubic relation which is intimately connected to certain bialgebras known as affine quantum groups and their representations. In the presence of a boundary, a quartic relation known as the reflection equation is the natural analogue. It arises naturally in the representation theory of certain pairs (affine quantum group, coideal subalgebra). We will survey this and highlight some recent work: the classification of solutions in the case of quantum affine sl_N (joint work with V. Regelskis). We will also outline some work in progress about the axiomatic characterization and construction of so-called universal solutions (joint with R. Weston and A. Appel, respectively).
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ICMSLecture Theatre (room 5.10)2018-10-17Preseminar for PhD studentsJan de BoerUniversity of AmsterdamProbing the interior of typical black hole microstatesTBA
Marc-Antoine FisetUniversity of OxfordSuperconformal algebras and G-structure symmetries in generic (1,0) sigma-modelsConformal field theories with higher spin currents have been known to govern type II string dynamics in exceptional holonomy manifolds since the work of Shatashvili and Vafa. From a nonlinear sigma-model viewpoint, the reduction of holonomy yields chiral symmetries extending (1,1) supersymmetry. I will generalise this result to generic (1,0) models with Fermi superfields, appropriate in particular for heterotic compactifications. I will then comment on anomalies of these symmetries, as a first step to bridge the gap between target space geometry and abstract conformal field theory. Based on 1809.01138.
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ICMSSeminar Room2018-10-31Preseminar for PhD studentsDavid SkinnerCambridgeTBATBA
Paolo GloriosoUniversity of ChicagoTBATBA
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ICMSSeminar Room2018-11-14Preseminar for PhD studentsDavid VeghQueen MaryTBATBA
Pietro Benetti GenoliniCambridgeTBATBA
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ICMSSeminar Room2018-11-28Preseminar for PhD studentsMarius de LeeuwTrinity College DublinTBATBA
Agata SmoktunowiczUniversity of EdinburghTBATBA
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ICMSSeminar Room2018-12-12Preseminar for PhD studentsBenjamin DoyonKing's College LondonTBATBA
Nabil IqbalDurham UniversityTBATBA