The{N/D}-Conjecture for Nonresonant Hyperplane Arrangements

Abstract

This paper studies Bernstein--Sato polynomials $b_{f,0}$ for homogeneous polynomials $f$ of degree $d$ with $n$ variables. It is open to know when $-\frac{n}{d}$ is a root of $b_{f,0}$. For essential indecomposable hyperplane arrangements, this is a conjecture by Budur, Mustaţă and Teitler and implies the strong topological monodromy conjecture for arrangements. Walther gave a sufficient condition that a certain differential form does not vanish in the top cohomology group of Milnor fiber. We use Walther's result to verify the $\frac{n}{d}$-conjecture for weighted hyperplane arrangements satisfying the nonresonant condition.

11 pages, comments welcome!