Week 18.07.2020 – 26.07.2020


Superconformal RG Interfaces in Holography

Informal Seminar Matthew Cheung (Imperial College London)

14:00 IC
room online - instructions in abstract

Defects/interfaces/boundaries are interesting objects to study in QFT, and one powerful way to study them is via the use of holography. In this talk, I will discuss our construction of gravitational solutions that holographically describe two different 4d SCFTs joined together at a co-dimension one, planar RG interface and preserving 3d superconformal symmetry. The RG interface we have constructed joins the 4d N=4 SYM theory on one side with the N=1 Leigh-Strassler SCFT on the other. These solutions in general are associated with spatially dependent mass deformations on the N=4 SYM side, but there is a particularly interesting solution for which these deformations vanish. If time allows, I will also discuss another example of our work involving ABJM theory and two 3d N=1 SCFTs with G_2 symmetry. This talk is based on the work hep-th/2007.07891 with Igal Arav, Jerome Gauntlett, Matt Roberts and Chris Rosen. ----- Follow the usual link or contact the organisers (Antoine Bourget and Edoardo Vescovi).


Pre-fundamental representations for the Hubbard model and AdS/CFT

Journal Club Carlo Meneghelli (Oxford)

15:00 Other
room Zoom, instructions in abstract

There is a class of representations of quantum groups, referred to as prefundamental representations, that plays an important role in the solution of integrable models. The first example of such representations was given by V. Bazhanov, S. Lukyanov and A. Zamolodchikov in the context of two dimensional conformal field theory in order to construct Baxter Q-operators as transfer matrices. At the same time, there is a rather exceptional quantum group that governs the integrable structure of the one dimensional Hubbard model and plays a fundamental role in the AdS/CFT correspondence. In this talk I will introduce prefundamental representations for this quantum group, explain their basic properties and discuss some of their applications. ------------- Part of London Integrability Journal Club. New participants please register at integrability-london.weebly.com to receive the link. (Registration is needed only once).