String Theory Seminar
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Mon, 23/04/2007 12:00 |
Andrew Dancer (Oxford) |
String Theory Seminar  |
L3 |
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Mon, 30/04/2007 12:00 |
Ilka Brunner (ETH Zurich) |
String Theory Seminar |
L3 |
| The behaviour of D2-branes on the quintic under complex structure deformations is analysed by combining Landau-Ginzburg techniques with methods from conformal field theory. It is shown that the boundary renormalisation group flow induced by the bulk deformations is realised as a gradient flow of the effective space time superpotential which is calculated explicitly to all orders in the boundary coupling constant. | |||
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Mon, 07/05/2007 12:00 |
Amir Kashani-Poor (Amsterdam) |
String Theory Seminar |
L3 |
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Mon, 14/05/2007 12:00 |
Martin Wolf (Imperial College, London) |
String Theory Seminar |
L3 |
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By generalizing and extending some of the earlier results derived by
Manin and by Merkulov, a twistor description is given of four-dimensional
N-extended (gauged) self-dual supergravity with and without cosmological
constant. In particular, superconformal structures are introduced and used
as a starting point to define complex quaternionic, quaternionic Kaehler and
hyper-Kaehler supermanifolds. A supersymmetry generalization of the Penrose
and Ward constructions are presented.
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Mon, 21/05/2007 12:00 |
Mark Haskins |
String Theory Seminar |
L3 |
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Mon, 28/05/2007 12:00 |
Paul Aspinwall (Duke University) |
String Theory Seminar |
L3 |
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Wed, 30/05/2007 12:00 |
Arkady Tseytlin (Imperial College, London) |
String Theory Seminar |
L3 |
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Mon, 04/06/2007 12:00 |
Andrew Hodges (Oxford) |
String Theory Seminar |
L3 |
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Amplitudes in gauge theory at tree-level can be expressed economically
in terms of twistor diagrams (hep-th/0503060, hep-th/0512336). This
formalism has recently been used to write down the 8-field scattering
amplitudes in a simple form, going beyond the results previously obtained
(hep-th/0603101). This talk will give an elementary account of how this is
done.
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Wed, 06/06/2007 12:00 |
Ruth Britto (Amsterdam) |
String Theory Seminar |
L3 |
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Gauge theory amplitudes lie at the meeting ground of perturbative QCD and
twistor string theory. The past three years have seen dramatic
developments in the analytic computation of amplitudes and their
interpretation in twistor space geometry. I will discuss applications to
collider experiments and describe direct, systematic procedures for deriving
one-loop amplitudes from tree amplitudes, using new insights regarding
unitarity.
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Mon, 11/06/2007 12:00 |
String Theory Seminar |
L3 | |
