Triangle Seminars
Monday, 8 Dec 2008
Deep Inelatsic Scattering in AdS/CFT
Anastasios Taliotis
(Ohio)
Abstract:
The total cross section for the scattering of a quark anti-quark dipole on a large nucleus at high energy is calculated. The system is studied within the framework of a strongly coupled N = 4 super Yang-Mills theory and the problem is solved using the AdS/CFT correspondence. The nucleus is modeled by a metric of a shock wave in AdS5. The expectation value of the Wilson loop (the dipole) is calculated by finding the extrema of the Nambu-Goto action for an open string attached to the quark and antiquark lines of the loop in the background of an AdS5 shock wave. Two physically meaningful extremal string configurations are found. For both solutions, the forward scattering amplitude N for the quark dipolenucleus scattering is found and is being investigated. The results are analyzed and compared with those in the literature. In particular for both solutions the saturation scale Qs (i.e. the scale where the partons densities inside the nucleus reach their maximum values) at high enough energy, becomes energy independent. In addition, the pomeron intercept that corresponds to a single graviton exchange is calculated and conjectured to be equal to aP =1.5.
The total cross section for the scattering of a quark anti-quark dipole on a large nucleus at high energy is calculated. The system is studied within the framework of a strongly coupled N = 4 super Yang-Mills theory and the problem is solved using the AdS/CFT correspondence. The nucleus is modeled by a metric of a shock wave in AdS5. The expectation value of the Wilson loop (the dipole) is calculated by finding the extrema of the Nambu-Goto action for an open string attached to the quark and antiquark lines of the loop in the background of an AdS5 shock wave. Two physically meaningful extremal string configurations are found. For both solutions, the forward scattering amplitude N for the quark dipolenucleus scattering is found and is being investigated. The results are analyzed and compared with those in the literature. In particular for both solutions the saturation scale Qs (i.e. the scale where the partons densities inside the nucleus reach their maximum values) at high enough energy, becomes energy independent. In addition, the pomeron intercept that corresponds to a single graviton exchange is calculated and conjectured to be equal to aP =1.5.
Posted by: IC
Tuesday, 9 Dec 2008
Random Matrices and Random Graphs
Uzy Smilansky
(Weizmann Institute)
Wednesday, 10 Dec 2008
LHC and the Search for the Higgs Boson
Nick Evans
(University of Southampton)
Abstract:
The Large Hadron Collider is just beginning it's work as the highest energy proton proton collider ever made. After a brief introduction to the machine I will concentrate on it's main goal - the search for the Higgs boson. The Higgs is the missing particle from the Standard Model of particle physics which makes the model well behaved at high energy and generates particle mass. Something has to be there to do the job of the Higgs but there are hints of flaws in the simplest model that have led to many suggestions for new physics from particle compositeness to extra space-time dimensions.
The Large Hadron Collider is just beginning it's work as the highest energy proton proton collider ever made. After a brief introduction to the machine I will concentrate on it's main goal - the search for the Higgs boson. The Higgs is the missing particle from the Standard Model of particle physics which makes the model well behaved at high energy and generates particle mass. Something has to be there to do the job of the Higgs but there are hints of flaws in the simplest model that have led to many suggestions for new physics from particle compositeness to extra space-time dimensions.
Posted by: KCL
Brownian motion and AdS/CFT
Jan de Boer
(University of Amsterdam)
Abstract:
TBA
TBA
Posted by: KCL
Conformal Interfaces and String Symmetries
Costas Bachas
(ENS Paris)
Friday, 12 Dec 2008
Applied String Theory: Transport properties of holographic defects
Matthias Wapler
(Perimeter institute)
Abstract:
I will describe recent efforts in applying the AdS/CFT correspondence to Condensed Matter Physics. In particular, we study the charge transport properties of fields confined to a (2+1)-dimensional defect coupled to a (3+1) dimensional super-Yang-Mills theory at large-N_c and strong coupling, using AdS/CFT techniques applied to linear response theory.
I will describe recent efforts in applying the AdS/CFT correspondence to Condensed Matter Physics. In particular, we study the charge transport properties of fields confined to a (2+1)-dimensional defect coupled to a (3+1) dimensional super-Yang-Mills theory at large-N_c and strong coupling, using AdS/CFT techniques applied to linear response theory.
Posted by: QMW