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Seminars at

Found 9 result(s)

16.04.2020 (Thursday)

A review of the AdS/CFT Quantum Spectral Curve

Journal Club Fedor Levkovich-Maslyuk (ENS Paris)

at:
10:00 Other
room online seminar
abstract:

I will give an introduction to the Quantum Spectral Curve in AdS/CFT. This is an integrability-based framework which provides the exact spectrum of planar N = 4 super Yang-Mills theory (and of the dual string model) in terms of a solution of a Riemann-Hilbert problem for a finite set of functions. I review the underlying QQ-relations starting from simple spin chain examples, and describe the special features arising for AdS/CFT. I will also present some pedagogical examples to show the framework in action. Lastly I will briefly discuss its recent applications for correlation functions. Based on the review arXiv:1911.13065. NOTE: online seminar using Zoom. Please register to the mailing list on integrability-london.weebly.com to participate.

09.04.2020 (Thursday)

Integrable sigma models and RG flow

Journal Club Nat Levine (Imperial College)

at:
10:00 Other
room online seminar
abstract:

It is often suggested that integrable 2d sigma models should be renormalizable, however this relationship has only previously been checked in the 1-loop approximation. The aim of this work is to understand what happens beyond 1-loop. We shall pedagogically introduce the lambda- and eta-models, and non-abelian duality. Based on these examples, we confirm that classically integrable sigma models appear to be 2-loop renormalizable if supplemented with a particular choice of finite counterterms, i.e. quantum corrections to the target space geometry. The 2-loop beta-function of the lambda-model is computed, matching the known results for groups and symmetric spaces in the limit when the lambda-model becomes the corresponding non-abelian dual model. This leads to the statement that non-abelian duality commutes with the RG flow beyond 1-loop order. NOTE: Please register to the mailing list at integrability-london.weebly.com to receive the link for the Zoom meeting.

02.04.2020 (Thursday)

Bootstrapping 1/2 BPS line defects in N=4 SYM

Journal Club Carlo Meneghelli (Oxford)

at:
10:00 Other
room online
abstract:

I will present some results on the 1d Super-Conformal Field Theory (SCFT) living on a 1/2-BPS line defect in a 4d N=4 SCFT. The main realization of this setup being Wilson lines in N=4 Super-Yang-Mills (SYM). After reviewing what the modern numerical bootstrap have to say about this problem I will describe how analytic bootstrap methods can efficiently produce the perturbative expansion at strong coupling in the planar theory. NOTE: This will be an online seminar using Zoom. Please register at integrability-london.weebly.com to receive the link

26.03.2020 (Thursday)

Recent advancements in Separation of Variables for higher rank

Journal Club Paul Ryan (Trinity College Dublin)

at:
10:00 Other
room online seminar
abstract:

"I will review recent advancements in the development of the Separation of Variables (SoV) program for rational higher rank spin chains, motivated by the recent appearance of SoV-type structures in AdS/CFT. I will discuss the main approaches for constructing a separated variable basis which include diagonalising the B-operator and the action of fused transfer matricies on a suitable vacuum state. I will explain how these approaches are linked and demonstrate how they can be unified into a single framework governed by Yangian representation theory. The outcome is that for any finite-dimensional su(n) spin chain the wave functions (Bethe vectors) factorise into an ascending product of Slater determinants in Baxter Q-functions, allowing us to immediately link this operatorial construction of states with the recently developed functional approach of computing scalar products and form factors." NOTE: this will be an online seminar using Zoom. To participate please fill the registration form on integrability-london.weebly.com.

19.03.2020 (Thursday)

TBA for the g-function

Journal Club Edoardo Vescovi (Imperial College)

at:
10:00 Other
room online
abstract:

The notion of integrability can be extended to systems with boundaries. In large volume and finite temperature, the free energy of such systems – unlike those periodic – contains a non-extensive piece, called g-function, with many physical interpretations. We present a method [1906.07733] hybrid of [1003.5542, 1007.1148, 1809.05705] to calculate the g-function from the TBA partition function. NOTE: Thus is an online seminar using Zoom. Please follow the registration link on https://integrability-london.weebly.com/

12.01.2017 (Thursday)

South East Mathematical Physics seminar

Regular Seminar Allday Event (Kent)

at:
11:00 Other
room Mathematics Lecture Theatre, KENT
abstract:

All day event: speakers include Andrea Fontanella (Surrey), Ana Loureiro (Kent), Marika Taylor (Southampton) and Takato Yoshimura (King's College). Details: https://www.kent.ac.uk/smsas/personal/tcd/webpages/MP/semps7.htm

11.05.2013 (Saturday)

SMUK -- String Math UK 2013

Exceptional Seminar . . (Surrey)

at:
09:30 Other
room room 13 15 BA 01 Surrey Space Centre
abstract:

http://personal.maths.surrey.ac.uk/st/M.Wolf/conferences/smuk2013/index.html

10.05.2013 (Friday)

SMUK -- String Math UK 2013

Exceptional Seminar . . (Surrey)

at:
09:30 Other
room room 13 15 BA 01 Surrey Space Centre
abstract:

http://personal.maths.surrey.ac.uk/st/M.Wolf/conferences/smuk2013/index.html

04.03.2005 (Friday)

Strict quantisation and unbounded operators

Topology & Geometry Seminar Sebastien Racaniere (Cambridge)

at:
16:00 Other
room LMS Building, Russel Square
abstract:

In quantum physics, the operators associated with the position and the momentum of a particle are unbounded operators and C-algebraic quantisation, or strict quantisation, does therefore not deal with such operators. In this talk, I will show how to remedy this problem for Lie-Poisson manifolds (this includes dual of Lie algebras and cotangent bundle of manifolds). As an application, I will show with an example how the quantisation of the dual of the Lie algebroid associated to a Poisson manifold can lead to a quantisation of the Poisson manifold itself. The example I consider is the torus with constant symplectic structure, in which case I recover its usual C-algebraic quantisation.