Student Sessions
at the Summer school on String Theory organized by the Perimeter Institute

Henry Tye's lecture Notes



Session 1

6:15 Anton M. Zeitlin
On First Order Formalism in String Theory
6:30 Neil B. Copland
Fuzzy Funnels and Fivebrane Calibrations
6:45 Sam Pinansky
Toric Geometry, Y^{p,q}'s, and a new type of Dynamical Supersymmetry Breaking
7:00 Amjad Ashoorioon [30 minutes]
Generation of Primordial Magnetic Fields from Inflation with Cutoff

Session 2, Tuesday June 28 @ 6:15 PM Prof Balasubrahmanian

Session 3, Wednesday, June 29 @ 6:15 PM Prof Balasubrahmanian

Session 4, Thursday June 30 @ 6:15 PM

6:15 Libor Snobl (University of Montreal)
Poisson-Lie T-plurality and 3-dimensional conformally invariant sigma models
I shall briefly discuss the notion of Poisson-Lie T-dual, or more precisely Poisson-Lie T-plural models. Then, starting from the classification of 6-dimensional Drinfeld doubles and their decomposition into Manin triples I shall construct 3-dimensional PLT-plural models. Of special interest are those that are conformally invariant on the 1-loop level, i.e. satisfy vanishing beta function equations. Examples of such models will be presented.

6:30 Diego Chialva (SISSA, Trieste, Italy)
Long-Living Strings
Long-Living non-supersymmetric strings are of interest for many areas of cosmology, first of all for Cosmic Strings. I will identify what are supposed to be the perturbative fundamental string states with the longest life-time, I will describe their dynamics and in particular their gravitational emission. Hints to strings in the KKLMMT model are given.

6:45 Mboyo Esole (Lorentz Institute, Leiden University)
Geometric engineering of the first cosmic D string action in N=2 supergravity
Type IIB superstring compactified on a Calabi-Yau manifold gives an N=2 supergravity theory in four dimensions. Cosmic string solutions in N=2 supergravity could then provide a low energy description of cosmic superstrings. However,there is topological obstruction that prevents the existence of cosmic string potential in N=2 supergravity. Therefore cosmic string actions are only known in N=1 supergravity. I explain how to consistently obtain cosmic string actions and solutions in N=2 supergravity using new ideas in quaternionic and special Kahler Hodge geometry. The method can be applied to other BPS objects and enlarge the family of structures that admit an N=2 supergravity description.

7:00 Dieter Van den Bleeken (Institute for Theoretical Physics, Katholieke Universiteit Leuven)
Dirac actions for D-branes on backgrounds with fluxes
I will review the way to get the fermionic part of the action for a d-brane living in a general bosonic background. Also I will shortly mention how this leads to a natural redefinition of the worldvolume geometry.