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conference "Conference on Integrability in Gauge and String Theory 2010"
chaired by Shiraz Minwalla (Tata Institute, Mumbai) , Lisa Freyhult (Uppsala University) , Joseph Minahan (Uppsala University) , Konstantin Zarembo (ENS Paris) , Giuseppe Policastro (ENS Paris)
  from Monday 28 June 2010 (08:00)
to Friday 02 July 2010 (18:00)
at Nordita ( Oskar Klein lecture hall )
  Description:

The use of integrability has lead to remarkable progress in our understanding of non-perturbative dynamics in gauge theories and their relationship to string theory. Highly unexpected links between supersymmetric field theory, spin chains, and two-dimensional sigma-models have been discovered in recent years. These developments have lead to exact solutions for the dimensions of operators in planar N=4 supersymmetric Yang-Mills theory in four dimensions to any loop order. This is the first case where exact results of this type have been found for any interacting four dimensional field theory.

Progress in this field has been continuing at a rapid pace. This includes: applying the thermodynamic Bethe ansatz (TBA) and the development of the Y-system to compute so called finite size effects for operators with small engineering dimensions; computing scattering amplitudes at strong coupling using the integrability of the string world-sheet; finding new results in superconformal Chern-Simons theory.

The IGST2010 conference is intended to bring together experts in gauge theories, strings, and integrable systems in order to create a discussion forum for future developments in this rapidly evolving field. The conference will consist of 25 talks, each 50 minutes in length and with time allowed for questions afterward. Invitations for many of the speaking slots will be made later to allow for the latest developments.

The last day to register for the conference is 15 May 2010. The conference is part of the program "Integrability in String and Gauge Theories; AdS/CFT Duality and its Applications" which runs from 31 May to 09 July 2010 at Nordita. Please note that the conference registration is different than the registration for the program.

Material:
files Where to have lunch?;  files ;  files Information about the boat trip pdf 
 

Monday 28 June 2010 toptop
09:00 
Registration
09:55  Welcome (05') Lárus Thorlacius (Nordita)
10:00  Integrability of high energy scattering amplitudes in N=4 SUSY (1h00') (files Slides pdf  ) Lev Lipatov (Petersburg Nuclear Physics Institute)
11:00 
break
11:30  Quantum integrable spin systems and generalized Schur - Weyl duality (1h00') (files Slides  ) Petr Kulish (St. Petersburg Department of Steklov Mathematical Institute)

There are integrable (solvable) spin systems related to quantum groups (quasi-triangular Hopf algebras), with simple structure of space of states. The integrals of motion belong to a quotient A of the braid group, which is a centralizer of the symmetry quantum group of the system. The space of states is a direct sum of of tensor products of corresponding irreducible representations of A and the quantum group. This decomposition is multiplicity free.

12:30 
lunch
14:30  One-point functions for sine-Gordon model at finite temperature. (1h00') (files Slides pdf  ) Fedor Smirnov (LPTHE, Paris)

We apply the hidden fermionic structure of integrable models for computing the one-point functions of the primary fields and their descendants for Eucildean sine-Gordon model on the cylinder (at finite temperature). This allows in principle to write down the complete asymptotic series for the two-point functions.

15:30  Non-planarity and Integrability (1h00') (files Slides pdf  ) Charlotte Kristjansen (Niels Bohr Institutet, Copenhagen)
16:30 
break
17:00  Q-Operator Demystified (1h00') (files Slides pdf  ) Matthias Staudacher (Humboldt Universität zu Berlin)

I will present a novel construction of the Q-operator for systems with sl(n|m) symmetry.

18:30 
Reception

Tuesday 29 June 2010 toptop
10:00  The worldsheet low-energy limit of the AdS_4 x CP^3 superstring (1h00') (files Slides pdf  ) Dmitry BYKOV
11:00 
break
11:30  Why Y? Exploiting Hirota integrable dynamics in AdS/CFT (1h00') (files Slides  ) Vladimir KAZAKOV
12:30 
lunch
14:30  TBA and functional relations for the AdS_5/CFT_4 correspondence (1h00') (files Slides pdf  ) Roberto Tateo (universita` di Torino)

The exact anomalous dimensions of the single trace composite operators in the planar limit of $N=4$ super Yang-Mills can be studied in the framework of the Thermodynamic Bethe Ansatz method (TBA). In this talk, I will discuss the analytic properties of the TBA solutions -the Y-functions- and the associated set of functional relations -the Y-system-. Contrary to the more studied relativistic invariant cases, the $AdS_5/CFT_4$-related Y-functions live on multi-sheeted coverings of the complex plane with an infinite number of square-root branch points. As a direct consequence of this fact, the TBA equations and in particular the dressing kernel cannot be obtained from the Y-system without extra information on the square-root discontinuities across semi-infinite segments in the complex plane. It is shown that the discontinuity functions fulfill an independent simple set of local functional equations. The Y-system extended by the discontinuity relations forms a fundamental set of local non-linear constraints that can be easily transformed into integral form through Cauchy's theorem.

15:30  On the Mirror TBA (1h00') (files Slides pdf  ) Gleb Arutyunov (Universiteit Utrecht)

I will discuss some subtleties of the Thermodynamic Bethe Ansatz for the AdS_5 x S^5 mirror model concerning the construction of excited states and their analytic properties. I will then use the TBA equations to derive the five-loop anomalous dimension of the Konishi operator and argue that the corresponding result agrees with the one obtained via the generalized Luscher formulae.

16:30 
break
17:00  The classical R-matrix of AdS/CFT (1h00') (files Slides pdf  ) Benoit Vicedo (Saclay)

After reviewing the R-matrix approach to classical integrable systems, we formulate the classical integrable structure of sigma-models relevant to the AdS/CFT correspondence.


Wednesday 30 June 2010 toptop
10:00  Quantum Deformations of Worldsheet Scattering (1h00') (files Slides pdf  ) Niklas Beisert (AEI, Potsdam)
11:00 
break
11:30  Spin Chains for N=2 Superconformal Theories: Integrability in the Veneziano Limit? (1h00') (files Slides pdf  ) Leonardo Rastelli (Stony Brook University)
12:30 
lunch
14:30  An operator product expansion for null polygonal Wilson loops (1h00') (files Slides pdf  ) Juan Maldacena (IAS Princeton)

We consider polygonal Wilson loops with null edges in conformal gauge theories. We derive an OPE-like expansion when several successive lines of the polygon are becoming aligned. The limit corresponds to a collinear, or multicollinear, limit and we explain the systematics of all the subleading corrections, going beyond the leading terms that were previously considered. These subleading corrections are governed by excitations of high spin operators, or excitations of a flux tube that goes between two Wilson lines. The discussion is valid for any conformal gauge theory, for any coupling and in any dimension. For N=4 super Yang Mills we check this expansion at strong coupling and at two loops at weak coupling . We also make predictions for the remainder function at higher loops. We will also discuss aspects of the excitations around the relevant flux tube or "sea of derivatives''

15:30  A & B model approaches to surface operators and Toda theories (1h00') (files Slides pdf  ) Niclas Wyllard

In the first part I will give an overview of the recent results relating 4d N=2 quiver gauge theories, 2d conformal Toda field theories, topological string theories and quiver matrix models. In the second part surface operators in the gauge theories and their dual interpretations in the other classes of theories will be discussed

16:30 
break
17:00  Yangians and Grassmannians in N=4 super Yang-Mills (1h00') (files Slides pdf  ) Livia Ferro (LAPTH Annecy)

Thursday 01 July 2010 toptop
10:00  Perturbative quantum gravity from gauge theory (1h00') (files Slides pdf  ) Henrik Johansson (Saclay)

In recent years it has become clear that gauge theory and gravity amplitudes exhibit remarkable simplicity and beautiful structures. Here I will discuss one such structure: a duality between color and kinematics in gauge theory amplitudes. The duality implies nontrivial relations between color-ordered partial tree amplitudes. Remarkably the duality dictates the construction of gravity amplitudes as a double copy of gauge theory kinematic factors, clarifying the Kawai-Lewellen-Tye relations of open and closed strings. Originally considered as a classical (tree-level) duality, here I will present evidence that the duality is valid at the quantum level as well.

11:00 
break
11:30  Scattering amplitudes on the Coulomb branch of N=4 super Yang-Mills (1h00') (files Slides pdf  ) Johannes Henn (Humboldt Universität zu Berlin)
12:30 
lunch
14:30  Classical Polylogarithms for Amplitudes and Wilson Loops (1h00') (files Slides pdf  ) Marcus Spradlin (Brown University)
15:30  The Y-system for scattering amplitudes (1h00') Pedro Vieira (Perimeter Institute)

We compute N=4 Super Yang Mills planar amplitudes at strong coupling by considering minimal surfaces in AdS_5 space. The surfaces end on a null polygonal contour at the boundary of AdS. We show how to compute the area of the surfaces as a function of the conformal cross ratios characterizing the polygon at the boundary. These equations have the form of Thermodynamic Bethe Ansatz equations. The area is the free energy of the TBA system. We consider any number of gluons and in any kinematic configuration.

16:30 
break
17:00  Superconformal invariance of scattering amplitudes in N=4 super-Yang-Mills theory (1h00') (files Slides pdf  ) Emery Sokatchev (LAPTH, Annecy)

We discuss the realization of dual and conventional superconformal symmetries on the scattering amplitudes in N=4 SYM. While these symmetries are exact at tree level, they have to be complemented with analytic properties to fully fix the tree. At loop level both symmetries are broken by different mechanisms. We describe the formulation of amplitudes in twistor space and in terms of Grassmannian invariants.

18:00 
dinner

Friday 02 July 2010 toptop
09:30  5-loop test of the AdS/CFT spectral equations (1h00') (files Slides pdf  ) Tomasz Łukowski (Uniwersytet Jagielloński, Kraków)

I will review the computation of the anomalous dimension for twist-2 operators at five loop order at weak coupling. This result provides us with data for testing the veracity of the spectral equations for planar AdS/CFT.

10:30  Weak coupling tests of the mirror TBA (1h00') (files Slides pdf  ) Arpad Hegedus (KFKI, Budapest)

The mirror Thermodynamic Bethe Ansatz (TBA) approach offers a tool to investigate the spectrum of AdS/CFT in the planar limit. The TBA equations governing the spectrum are based on several conjectures this is why it is important to test them carefully. In this talk we will focus on the analytical tests of the AdS/CFT TBA system in the weak coupling limit and show that the 5-loop anomalous dimensions of the twist-2 operators of the sl(2) sector derived from the TBA equations agree with the results obtained previously from the generalized Luscher formulae.

11:30 
break
12:00  Correlation functions of operators dual to classical string states (1h00') (files Slides pdf  ) Romuald Janik (Uniwersytet Jagielloński, Kraków)
13:00 
lunch
14:15  Strings in the AdS light-cone gauge and the generalized scaling function (1h00') (files Slides pdf  ) Radu Roiban (Pennsylvania State University)
15:15  Summary talk (45') (files Slides pdf  ) Arkady Tseytlin (Imperial College London)

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