`Found 4 result(s)`

Regular Seminar Dario Martelli (King's)

at:15:00
room B103 | abstract: I will discuss some exact results in supersymmetric field theories, focussing on the localization technique in supersymmetric gauge theories and its interplay with holography. |

Regular Seminar Dario Martelli (King's)

at:13:15
room 423 | abstract: After briefly reviewing the notion of geometries characterised by SU(3) structures, I will discuss a particular class known (in String Theory) as non-Kahler. I will explain how this arises both in Type II and Heterotic Supergravities. Two explicit constructions of these geometries will be discussed. One is a one-parameter solution corresponding to fivebranes wrapped on the two-sphere of the resolved conifold, that can be thought of as a non-Kahler analog of the conifold. The other is a general construction of one-parameter non-Kahler deformations of Calabi-Yau manifolds with a U(1) isometry, where the non-Abelian Yang-Mills field of the Heterotic is non-trivial. The presentation will be loosely based on the two papers: arXiv:0906.0591 and arXiv:1010.4031. |

Triangular Seminar Dario Martelli (Swansea)

at:15:00
room Physics LG1 | abstract: I will discuss a supergravity solution corresponding to fivebranes wrapped on the S2 of the resolved conifold. By changing a parameter the solution continuously interpolates between the deformed conifold with flux and the resolved conifold with branes. Therefore, it displays a geometric transition, purely in the supergravity context. The solution is a simple example of torsional geometry and may be thought of as a non-Kahler analog of the conifold. I will discuss how one can obtain supersymmetric solutions of type IIB supergravity starting from simpler non-Kahler geometries, by U-dualities or other methods. Applying these transformations to the torsional conifold solution we obtain a solution dual to the baryonic branch of the Klebanov-Strassler theory. Far along the baryonic branch the solution resembles D5 branes wrapping a fuzzy two-sphere in the resolved conifold and this can be matched to a weakly coupled field theory analysis. |