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Date | 2024-03-20 |
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Speaker | Matt Larson |

Dept. | Stanford University |

Room | 129-406 |

Time | 15:45-18:00 |

**※ 시간: **

**Pretalk: 오후 3시 45분~4시 45분** (The pretalk is tailored specifically for graduate students with varying backgrounds, so please do not hesitate to join!)

**Research talk: 오후 5시~6시**

**Pretalk**

Title: Topology of singularities of complex hypersurfaces

Abstract: The Milnor fibration is a powerful tool to study the topology of a singularity of a complex hypersurface. It can be used to compute the cohomology of a deleted neighborhood of the singularity, which is used to analyze some exotic spheres. I will describe the fundamental theorems governing the topology of hypersurface singularities and how the Milnor fibration can be used to compute topological invariants of them.

**Research talk**

Title: The monodromy conjecture for simplicial nondegenerate singularities

Abstract: Let f be a polynomial with integer coefficients. The monodromy conjecture predicts a relationship between the Igusa zeta function of the hypersurface V(f), which governs the number of solutions to f = 0 (mod p^n) for a prime p, and the eigenvalues of the monodromy action on the cohomology of the Milnor fiber, which is a topological invariant of the complex hypersurface. When f is nondegenerate with respect to its Newton polyhedron, which is true for "generic" polynomials, there are combinatorial formulas for both the Igusa zeta function and the eigenvalue of monodromy. I will describe recent results (joint with S. Payne and A. Stapledon) which prove a version of the monodromy conjecture for nondegenerate polynomials which have a simplicial Newton polyhedron.

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