Found 7 result(s)

08.10.2015 (Thursday)

Higher charge half-BPS four-point correlation functions in planar N=4 SYM

Regular Seminar Paul Heslop (Durham)

 at: 14:00 QMWroom G.O. Jones 610 abstract: We will show how to obtain half-BPS four-point correlation functions in N=4 SYM at up to 3 loops using symmetries, analytic properties the Wilson loop/correlator duality, planarity and some minimal knowledge of the OPE structure relating four-point correlators of different charges. These can be used to verify recent predictions for OPE coefficients arising from integrability.

24.10.2013 (Thursday)

Four point correlation functions and 5-point amplitudes

Regular Seminar Paul Heslop (Durham University)

 at: 14:00 QMWroom Room 208 abstract: Abstract: There has been much progress in understanding the four-point correlator of Stress Energy multiplets in N=4 SYM recently. I will discuss recent progress in evaluating high loop Feynman integrals using leading singularities, asymptotics and the symbol. This is used to evaluate the three-loop four-point correlation function from its integrand. Then I will show how the full (parity even and odd) 5-point amplitude can be found from the same four-point correlator integrand.

12.05.2011 (Thursday)

Dualities for scattering amplitudes in planar N=4 SYM

Regular Seminar Paul Heslop (Durham)

 at: 14:00 QMWroom 602 abstract: I will review weak-weak dualities relating scattering amplitudes to Wilson loops on the one hand and correlation functions of gauge invariant operators on the other. The Wilson loop / amplitude duality has lead to both numerical and analytic results for MHV scattering amplitudes at two-loops and beyond, including the determination of two loop MHV n-point scattering amplitudes for any n in a certain kinematical regime. The duality with correlation functions has been extended to all scattering amplitudes in the theory and we give explicit examples illustrating this.

25.03.2009 (Wednesday)

Amplitudes, Wilson loops and dual superconformal symmetry

Regular Seminar Paul Heslop (Queen Mary)

 at: 14:00 ICroom H503 abstract: We introduce the Wilson loop/amplitude duality, which states that certain gluon amplitudes in N=4 SYM are equivalent to light-like polygonal Wilson loops. We will illustrate the duality's power by computing the one loop Wilson loop analytically (matching with the known amplitudes) and then the two loop Wilson loop numerically for any number of edges. If the duality continues to hold we can thus compute two loop MHV amplitudes for any number of incoming particles. In the second part of the talk we discuss the recently conjectured new symmetry dual superconformal symmetry of the complete S-matrix of N=4 SYM. We prove its presence at tree-level and find new constraints it puts on the one loop amplitude.

12.10.2006 (Thursday)

N=4 Superconformal Characters and Partition Functions

Regular Seminar Paul Heslop (QMUL)

 at: 14:00 QMWroom 112 abstract:

22.03.2006 (Wednesday)

The Higher Spin/CFT Correspondence

Regular Seminar Paul Heslop (DAMTP)

 at: 13:00 QMWroom 112 abstract:

02.11.2005 (Wednesday)

On the higher spin - gauge theory correspondence

Regular Seminar Paul Heslop (DAMTP)

 at: 13:15 KCLroom 423 abstract: