Triangle Seminars
Wednesday, 29 Oct 2008
Higher-loop amplitudes in Maximal Supergravity and String Theory
📍 London
Pierre Vanhove
(Saclay)
Abstract:
We will describe the recent progresses in the computation of
four-graviton amplitudes at higher-loop order in maximal supergravity and string theory in various dimensions.
We will discuss the constraints from dualities and the extended supersymmetry on the structure of the amplitudes. We will explain that the cross-symmetry of gravity, maximal supersymmetry, and the constraints from higher dimensions play an important role in the improved ultraviolet behaviour of maximal supergravity in four dimensions.
We will describe the recent progresses in the computation of
four-graviton amplitudes at higher-loop order in maximal supergravity and string theory in various dimensions.
We will discuss the constraints from dualities and the extended supersymmetry on the structure of the amplitudes. We will explain that the cross-symmetry of gravity, maximal supersymmetry, and the constraints from higher dimensions play an important role in the improved ultraviolet behaviour of maximal supergravity in four dimensions.
Posted by: KCL
The SU(2) X SU(2) sector of type IIA string theory on AdS4 X CP3
Marta Orselli
(Neils Bohr Institute)
Abstract:
I will examine the string dual of the recently constructed N = 6 superconformal Chern-Simons theory
of Aharony, Bergman, Jafferis and Maldacena (ABJM theory). In particular I will focus on the SU(2)X
SU(2) sector. I will derive the full magnon dispersion relation and compare it to recently found results for ABJM theory at weak coupling.
Then I will consider finite-size corrections to the energy of string states in the
R X S2 X S2 subspace of AdS4 X CP3 with an angular momentum J on CP3 being large, using two different approaches.
I will compare the results with the recently proposed all-loop Bethe ansatz of Gromov and Vieira.
I will examine the string dual of the recently constructed N = 6 superconformal Chern-Simons theory
of Aharony, Bergman, Jafferis and Maldacena (ABJM theory). In particular I will focus on the SU(2)X
SU(2) sector. I will derive the full magnon dispersion relation and compare it to recently found results for ABJM theory at weak coupling.
Then I will consider finite-size corrections to the energy of string states in the
R X S2 X S2 subspace of AdS4 X CP3 with an angular momentum J on CP3 being large, using two different approaches.
I will compare the results with the recently proposed all-loop Bethe ansatz of Gromov and Vieira.
Posted by: IC
On quantum field theory with deformed Poincare symmetry
Charles Young
(Durham University)
Abstract:
There exists a family of deformations of Minkowski spacetime, and its Poincare symmetries, parameterized by a mass-scale
kappa. I will discuss some recent work in which ideas from the theory of quantum groups are applied to the problem of formulating kappa-deformed quantum field theory.
There exists a family of deformations of Minkowski spacetime, and its Poincare symmetries, parameterized by a mass-scale
kappa. I will discuss some recent work in which ideas from the theory of quantum groups are applied to the problem of formulating kappa-deformed quantum field theory.
Posted by: KCL