String Theory Seminar
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Mon, 02/05/2011 12:00 |
String Theory Seminar  |
L3 | |
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Mon, 09/05/2011 12:00 |
Sara Pasquetti (QMUL) |
String Theory Seminar |
L3 |
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Mon, 16/05/2011 12:00 |
Tom Bridgeland (Oxford) |
String Theory Seminar |
L3 |
| This talk will be about spaces of stability conditions. I will start by recalling Mike Douglas' original work on Pi-stability for D-branes, and go on to explain a couple of of the main open questions in the subject. The second half of the talk will focus on an illustrative example, namely the case of the local projective plane. | |||
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Mon, 23/05/2011 12:00 |
Amihay Hanany (Imperial College) |
String Theory Seminar |
L3 |
| Given a graph with lines and 3-valent vertices, one can construct, using a simple dictionary, a Lagrangian that has N=2 supersymmetry in 3+1 dimensions. This is a construction which generalizes the notion of a quiver. The vacuum moduli space of such a theory is well known to give moment map equations for a HyperKahler manifold. We will discuss the class of hyperkahler manifolds which arise due to such a construction and present their special properties. The Hilbert Series of these spaces can be computed and turns out to be a function of the number of external legs and loops in the graph but not on its detailed structure. The corresponding SCFT consequence of this property indicates a crucial universality of many Lagrangians, all of which have the same dynamics. The talk is based on http://arXiv.org/pdf/1012.2119. | |||
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Mon, 30/05/2011 12:00 |
Evgenyi Buchbinder (Imperial College) |
String Theory Seminar |
L3 |
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Mon, 06/06/2011 12:00 |
Magdalena Larfors (LMU Munich) |
String Theory Seminar |
L3 |
| In the absence of background fluxes and sources, compactifying string theories on Calabi-Yau three-folds leads to supersymmetric solutions. Turning on fluxes, e.g. to lift the moduli of the compactification, generically forces the three-fold to break the Calabi-Yau conditions, and instead fulfill the weaker geometrical condition of having a reduced structure group. In this talk I will demonstrate that three-dimensional smooth, compact, toric varieties can have reduced structure group, and thus be suitable for flux compactifications of string theory. Since the class of three-dimensional SCTV is large, this is promising for the construction of new, phenomenologically interesting string theory vacua. | |||
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Mon, 13/06/2011 12:00 |
Sara Pasquetti (QMUL) |
String Theory Seminar |
L3 |
| Recently it has been shown that path integrals of N=4 theories on the three-sphere can be localised to matrix integrals. I will show how to obtain exact expressions of partition functions by an explicit evaluation of these matrix integrals. | |||
