Dr
Rutger Boels
(Niels Bohr International Academy (from sept. 1))
27/09/2007, 16:30
Many recent advances in the calculation of scattering amplitudes are inspired by
insights from twistor space as initiated by Witten. However, little direct use has
been made untill recently of the extra structure available on the twistor space.
Partly based on joint research with Lionel Mason and David Skinner, I will
present a simple method of deriving actions on twistor space from...
Dr
Nadav Drukker
(Humboldt University)
27/09/2007, 17:00
I will present some new results about supersymmetric Wilson loops in four dimensional
YM. First I will present a large class of operators preserving 1/2, 1/4, 1/8 and 1/16
of the supersymmetries of the vacuum. Then I will show a possible realtion between
some of those loops, following an arbitrary curve on an S^2 subspace of R^4 to Wilson
loops in two dimensional YM. To the extent that...
Dr
Mohab Abou Zeid
(Institut des Hautes Etudes Scientifiques, Bures-sur-Yvette)
27/09/2007, 17:30
I review the recent construction of a family of new twistor string theories which are
free from world-sheet anomalies and give the space-time spectra of Einstein
supergravities, with second order field equations, instead of the higher derivative
conformal supergravities that arose from earlier twistor strings. I then discuss the
calculation of gauge theory and gravity amplitudes in the...
