String Theory Seminar
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Mon, 10/10/2005 12:00 |
Chris Hull (Imperial) |
String Theory Seminar  |
L3 |
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Mon, 31/10/2005 12:00 |
Balazs Szendroi (Oxford) |
String Theory Seminar |
L3 |
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Mon, 07/11/2005 12:00 |
Annamaria Sinkovics |
String Theory Seminar |
L3 |
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Mon, 14/11/2005 12:00 |
Yang-Hui He (Oxford) |
String Theory Seminar |
L3 |
| /notices/events/abstracts/string-theory/mt05.he.shtml | |||
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Mon, 21/11/2005 12:00 |
Dan Waldram (Imperial) |
String Theory Seminar |
L3 |
| I aim to give some review of how generalised geometries provide a natural framework for describing supersymmetric string backgrounds. In particular I will focus on a rewriting of type II supergravity in terms of generalised structures. Hitchin functions appear naturally along with generalised extensions of the Gukov-Vafa-Witten superpotential. | |||
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Fri, 25/11/2005 12:00 |
Burt Ovrut (University of Pennsylvania) |
String Theory Seminar |
Fisher Room |
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Mon, 28/11/2005 12:00 |
Annamaria Sinkovics |
String Theory Seminar |
L3 |
| It is suggested that topological membranes play a fundamental role in the recently proposed topological M-theory. We formulate a topological theory of membranes wrapping associative three-cycles in a seven-dimensional target space with G_2 holonomy. The topological BRST rules and BRST invariant action are constructed via the Mathai-Quillen formalism. We construct a set of local and non-local observables for the topological membrane theory. As the BRST cohomology of local operators turns out to be isomorphic to the de Rham cohomology of the G_2 manifold, our observables agree with the spectrum of d=4, N=1 G_2 compactifications of M-theory. | |||
