Fri, 09 May 2008

15:15 - 16:15
L3

Slim Fields

Jochen Koenigsmann
(Oxford)
Wed, 04 Jun 2008

12:00 - 13:00
L3

Techniques for one-loop amplitudes in QCD

Giulia Zanderighi
(Oxford)
Abstract
Abstract: We discuss recent techniques to compute one-loop amplitudes in QCD and show that all N-gluon one-loop helicity amplitudes can be computed numerically for arbitrary N with an algorithm which has a polynomial growth in N.
Mon, 28 Apr 2008

12:00 - 13:00
L3

$G_2$ manifolds with isolated conical singularities

Spiro Karigiannis
(Oxford)
Abstract
Abstract: Compact $G_2$ manifolds with isolated conical singularities arise naturally in M-theory. I will discuss such manifolds, and explain a method to ``desingularize'' them by glueing in pieces of asymptotically conical $G_2$ manifolds. There are topological obstructions to such desingularizations that depend on the rate of convergence to the cone at the singularities, and on the geometry of the links of the cones. If time permits, I will also briefly discuss a new related project with Dominic Joyce which could provide the first examples of such manifolds, as well as a possible new construction of smooth compact $G_2$ manifolds.
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