String Seminars

This series consists of talks in the area of Superstring Theory.

Seminar Series Events/Videos

Currently there are no upcoming talks in this series.

 

Tuesday Jun 11, 2013
Speaker(s): 

I will describe recent results obtained for N=4 superconformal field
theories in four dimensions by means of the conformal bootstrap.

This talk will be related to the content of arXiv:1304.1803, as well as
some additional work in progress.

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Tuesday Jun 11, 2013

We show explicitly how the exact renormalization group
equation of interacting vector models in the large N limit can be
mapped into certain higher-spin equations of motion. The equations of

motion are generalized to incorporate a multiparticle extension of the
higher-spin algebra, which reflects the "multitrace" nature of the
interactions in the dual field theory from the holographic point of view.

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Tuesday May 14, 2013
Speaker(s): 

We discuss how bipartite graphs on Riemann surfaces encapture a wealth of information about the physics of large classes of supersymmetric gauge theories, especially those with quiver structure and arising from the AdS/CFT context. The correspondence between the gauge theory, the underlying algebraic geometry of it space of vacua, the combinatorics of dimers and toric varieties, as well as the number theory of dessin d'enfants becomes particular intricate under this light.

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Friday May 03, 2013
Speaker(s): 

We reconstruct the experience of an infalling observer
using the AdS/CFT correspondence.

We write operators both outside and inside the black hole
in terms of CFT operators.

Our construction provides a natural realization of black
hole complementarity, and a way of preserving information without the need for
firewalls.

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Tuesday Apr 30, 2013
Speaker(s): 

It has been known for twenty years that a class of
two-dimensional gauge theories are intimately connected to toric geometry, as
well as to hypersurfaces or complete intersections in a toric varieties, and to
generalizations thereof.  Under renormalization
group flow, the two-dimensional gauge theory flows to a conformal field theory
that describes string propagation on the associated geometry.  This provides a connection between certain
quantities in the gauge theory and topological invariants of the associated

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Friday Apr 05, 2013

Two-dimensional
models provide for a very attractive playground being a theory imitating some
of the main features of QCD. Those include the asymptotic freedom, mass gap,
confinement, chiral symmetry breaking and others. Furthermore, there is a correspondence between the spectra of
four-dimensional SQCD and N=(2,2) CP(N-1) sigma model which was discovered more
than a decade ago. This correspondence was explained later when it was found
that SQCD supports non-Abelian strings with confined monopoles. The kinks of

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Tuesday Apr 02, 2013

I discuss several recent efforts
in relating string field theory calculations of BMN BMN BMN and BMN BMN BPS
correlation functions to direct perturbative calculations and
integrability-assisted methods. I review the next-to-leading order agreement
between strings and perturbation theory in the SO(6) sector, a conjectured
extension of the integrability techniques by Escobedo, Gromov, Sever, Vieira from
the SU(2) to the full SO(6) sector and agreement with SFT and PT in it at the

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Tuesday Mar 26, 2013

In the study of the string/gauge theory duality (AdS/CFT), an important role is played by the relation between local operators and Wilson loops. Perhaps the most well known example is the relation between twist two operators and the light-like cusp Wilson loop. On the string side, the twist two operator is represented by a "long" string (GKP). In this talk I use T-duality to argue that such relation is also natural for "short" strings.

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Tuesday Mar 19, 2013
Speaker(s): 

We propose a new
approach for the calculation of the spectrum of excitations of QCD flux tubes.
It relies on the fact that the worldsheet theory is integrable at low energies.
With this approach, energy levels can be calculated for much shorter flux tubes
than was previously possible, allowing for a quantitative comparison with
existing lattice data. The improved theoretical control makes it manifest that
existing lattice data provides strong evidence for a new pseudoscalar particle

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