Week 17.10.2020 – 25.10.2020

Tuesday

Pushing the limits of the double copy

Regular Seminar Mariana Carrillo (Imperial College London)

at:
13:30 IC
room zoom 871 9223 5980
abstract:

The double copy in its original form allows us to obtain scattering amplitudes of gravity as the "square" of those of Yang Mills. I will explain how this squaring procedure works and how this relationship has been extended to classical solutions. I will also briefly mentioned how the double copy relationship can be extended to scalar effective field theories. [please email a.held@imperial.ac.uk for zoom link or password]

Integrable deformations and the doubled formalism

Regular Seminar Yuta Sekiguchi (Imperial College London)

at:
14:00 IC
room zoom 871 9223 5980
abstract:

The integrable deformation of string backgrounds has been one of the significant research directions to construct a variety of examples of gauge/gravity duality preserving integrability and to push forward the confirmation of AdS/CFT correspondence. In this introductory talk, I plan to give a basic review of classical integrability of string sigma models with a focus on Lax pairs, to consider the role of the doubled sigma model. [please email a.held@imperial.ac.uk for zoom link or password]

Wednesday

Liouville and JT quantum gravity - holography and matrix models

Regular Seminar Thomas Mertens (GENT U.)

at:
13:15 KCL
room Zoom
abstract:

In this talk, we will discuss recent progress in understanding quantum gravity amplitudes (partition function and boundary correlation functions) in Liouville gravity, and how they limit to Jackiw-Teitelboim (JT) correlators. We also discuss multiboundary and higher genus amplitudes. We focus on two main results: the Liouville gravity answers look like q-deformations of the JT answers, and Liouville gravity can be related to a 2d dilaton gravity with a sinh dilaton potential. We end with discussions on supersymmetric extensions and work in progress. Based largely on arXiv:2006.07072 and 2007.00998​. [For the Zoom link, please email to: alejandro.cabo_bizet@kcl.ac.uk ]

Thursday

An exact AdS/CFT correspondence

Journal Club Lorenz Eberhardt (IAS)

at:
15:15 Other
room Zoom, instructions in abstract
abstract:

One incarnation of the AdS/CFT correspondence is the duality between the symmetric product orbifold of T4 and superstrings on AdS3xS3xT4 with one unit of NS-NS flux. Compared to other instances of AdS/CFT, this duality is much simpler and can in principle be fully understood. I will give a broad overview of the inner workings of the duality from a worldsheet CFT point of view, physical lessons and connections to integrability. ---- Part of London Integrability Journal Club. If you are a new participant, please register filling the form at integrability-london.weebly.com. The link will be emailed.

Friday

Renormalons from Resurgence

Informal Seminar Tomas Reis (University of Geneva)

at:
13:00 KCL
room Zoom, See abstract
abstract:

In this talk I will present the use of resurgence techniques in identifying non-perturbation physics and its relation to renormalons, in light of recent work of Marcos Mariño and me. This exploration has touched 1+1 QFTs and condensed matter systems, revealing that the presence of renormalons is more widespread than expected. After introducing both ideas in the title, I will specialise in the case of the 1D fermion gas with dirac-delta attractive potential. This case is a clean example of our approach and unveils a curious interplay between resurgence, renormalons, and superconductivity. [Please email damian.galante@klc.ac.uk for the link]