Triangle Seminars
Monday, 24 Nov 2008
Gluons, Spin Chains and String Theory
Nick Dorey
(DAMTP, Cambridge)
Tuesday, 25 Nov 2008
Higgsing M2 worldvolume theories
Costis Papageorgakis
(TIFR, Mumbai)
Abstract:
I will be reviewing the details of a novel form of the Higgs mechanism,
present in the context of the Bagger-Lambert and ABJM proposals for the worldvolume
description of multiple parallel M2 branes. I will also discuss some of its implications
as well as describe related applications. The latter will focus on the determination of
four-derivative corrections to the Bagger-Lambert A_4-theory for all values
of the Chern-Simons level k
I will be reviewing the details of a novel form of the Higgs mechanism,
present in the context of the Bagger-Lambert and ABJM proposals for the worldvolume
description of multiple parallel M2 branes. I will also discuss some of its implications
as well as describe related applications. The latter will focus on the determination of
four-derivative corrections to the Bagger-Lambert A_4-theory for all values
of the Chern-Simons level k
Posted by: QMW
Wednesday, 26 Nov 2008
Lagrangians for multiple M2 branes
📍 London
Neil Lambert
(KCL)
Non-perturbative conformal invariance for time-dependent string backgrounds
Jean Alexandre
(King's College)
Abstract:
A specific configuration of the bosonic string is discussed, in
time-dependent backgrounds, which satisfies Weyl invariance to all
orders in the alpha'-expansion. Conformal invariance, valid in any space
time dimension, is based on the homogeneity (in time) of the Weyl-beta
functions which, using field redefinitions, can be made to vanish.
A specific configuration of the bosonic string is discussed, in
time-dependent backgrounds, which satisfies Weyl invariance to all
orders in the alpha'-expansion. Conformal invariance, valid in any space
time dimension, is based on the homogeneity (in time) of the Weyl-beta
functions which, using field redefinitions, can be made to vanish.
Posted by: IC
TBA
Rudolf Tange
(The University of York)
Abstract:
TBA
TBA
Posted by: KCL
Thursday, 27 Nov 2008
On the perturbative structure of the S-matrix of massless particles
Paolo Benincasa
(Durham University)
Abstract:
The analysis of the singularities in the S-matrix of particles has shown
that perturbative structure field theories can be much simpler than what
Feynman diagrams tell us. In particular, there exist classes of theories
whose perturbative S-matrix is completely determined by a sub-set of its
singularities. At tree level this reflect with the existence of recursion
relations. At loop level, there are special singularities, the leading
singularities, which are believed to determine a class of theories which
N=4 SYM and N=8 supergravity belongs to. I will discuss both the tree and
loop level, with a particular attention on the leading singularity
technique and its application to the investigation of the perturbative N=8
supergravity.
The analysis of the singularities in the S-matrix of particles has shown
that perturbative structure field theories can be much simpler than what
Feynman diagrams tell us. In particular, there exist classes of theories
whose perturbative S-matrix is completely determined by a sub-set of its
singularities. At tree level this reflect with the existence of recursion
relations. At loop level, there are special singularities, the leading
singularities, which are believed to determine a class of theories which
N=4 SYM and N=8 supergravity belongs to. I will discuss both the tree and
loop level, with a particular attention on the leading singularity
technique and its application to the investigation of the perturbative N=8
supergravity.
Posted by: QMW