Zeros of a growing number of derivatives of random polynomials with independent roots

Abstract

Let $X_1,X_2,\dots$ be independent and identically distributed random variables in $\mathbb{C}$ chosen from a probability measure $\mu$ and define the random polynomial $$P_n(z)=(z-X_1)\dots (z-X_n).$$ We show that for any sequence $k=k(n)$ satisfying $k\le \log n/(5\log \log n)$, the zeros of the $k$th derivative of $P_n$ are asymptotically distributed according to the same measure $\mu$. This extends work of Kabluchko, which proved the $k=1$ case, as well as Byun, Lee and Reddy who proved the fixed $k$ case.

arXiv comment12 pages