Event | SMS Weekly Talk |

Date | 02/21/2017 |

Time | 02:30 |

Venue | SMS Seminar Room |

Title | Topological Vertex Formalism |

Speaker | Umar Shahzad |

Abstract |
Gopakumar and Vafa introduced new topological invariants associated to a Calabi-Yau threefold _. These invariants are associated with a curve class_________ _ Later on, Vafa and others introduced a combinatorial algorithm to calculate these invariants associated to the toric Calabi-Yau threefold _. Having the trivalent graph associated to _, they associated a topological vertex ___(a rational function) to each vertex of the graph. _; _ and _ are the partitions assign to each edge of the vertex. In this talk, I will try to explain the algorithm for calculating the Gopakumar-Vafa invariants which I discussed above. We will also try to discuss some examples as well. |

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