Le contenu de cette page n’est pas disponible en français. Veuillez nous en excuser.

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.

 

Mardi mar 20, 2012
Speaker(s): 

I'll discuss solutions with Lifshitz scaling within
string supergravity for an arbitrary scaling component z. After showing how to
get exact Lifshitz spacetimes, I'll then look at more general solutions,
including black holes and flows between Lifshitz and adS spacetimes.

Collection/Series: 
Scientific Areas: 

 

Vendredi mar 02, 2012
Speaker(s): 

Quantum corrections to three-point functions of scalar single trace operators in planar ${\cal N}=4$ Super-Yang-Mills theory are studied using integrability. At one loop, we find  new algebraic structures that not only govern all two loop corrections to the mixing of the operators but also automatically incorporate all one loop diagrams correcting the tree level Wick contractions. Speculations about possible extensions of our construction to all loop orders are given. We also match our results with the strong coupling predictions in the classical (Frolov-Tseytlin) limit. 

Collection/Series: 
Scientific Areas: 

 

Mardi fév 28, 2012
Speaker(s): 

I will explain some recent exact developments in N=2 SUSY gauge theories on 3-sphere and its deformations. I will begin by the analysis of Killing spinors and their generalization which are necessary to construct SUSY theories on curved spaces. Then I will sketch the exact computation of partition function using SUSY localization and present a general formula. Some applications to the physics of M5-branes will also be discussed.

Collection/Series: 
Scientific Areas: 

 

Mardi fév 21, 2012
Speaker(s): 

Finding the exact, quantum corrected metric on the hypermultiplet moduli space in Type II string compactifications on Calabi-Yau threefolds is still an open problem. We address this issue by relating the quaternionic-Kähler metric on the hypermultiplet moduli space to the complex contact geometry on its twistor space. In this framework, Euclidean D-brane instantons are captured by contact transformations between different patches.

Collection/Series: 
Scientific Areas: 

 

Mardi fév 14, 2012
Speaker(s): 

In this talk we discuss a proposed dual matrix formulation of N = 4 Super Yang-Mills on R^4 coupled to 4D Einstein supergravity. We review the evidence accumulated so far in favor of this proposal, which includes a successful match of the symmetries of the continuum theory, and the computation of MHV gluon and graviton scattering amplitudes in terms of matrix model correlators. We also discuss some avenues of ongoing investigation.

Collection/Series: 
Scientific Areas: 

 

Vendredi fév 10, 2012
Speaker(s): 

Three-dimensional fluids with nontrivial vorticity can be described holographically. It is well-known that the Kerr-AdS geometry gives rise to a 'cyclonic' flow. Lorentzian Taub--NUT--AdS_4 geometries give rise to a rotating fluid with vortex flow.

Collection/Series: 
Scientific Areas: 

 

Jeudi fév 09, 2012

The boundary conditions of general black holes in asymptotically flat spacetimes can be modified such that a conformal symmetry emerges. The black holes with asymptotic geometry modified in this manner satisfy the equations of motion of minimal supergravity in one dimension more. Their symmetry suggests that a dual conformal field theory description exists that can account for the black hole entropy even in the case of black holes that are far from extremality.

Collection/Series: 
Scientific Areas: 

 

Mardi jan 31, 2012
Speaker(s): 

We evaluate the partition function of three dimensional general relativity with a negative cosmological constant, including all known perturbative and non-perturbative contributions to the sum over geometries.

Collection/Series: 
Scientific Areas: 

 

Mardi jan 24, 2012
Speaker(s): 

I will present a newly found duality between an infinite class of 3-dimensional N=4 gauge theories at their conformal IR fixed point and type IIB string theory solutions. This correspondence gives a new tool to explore the strongly coupled phase of the supersymmetric gauge theories in question.

Collection/Series: 
Scientific Areas: 

Pages