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The Common Limit of the Linear Statistics of Zeros of Random Polynomials and Their Derivatives (1701.03946v1)

Published 14 Jan 2017 in math.PR

Abstract: Let $ p_n(x) $ be a random polynomial of degree $n$ and ${Z{(n)}j}{j=1}n$ and ${X{n, k}j}{j=1}{n-k}, k<n$, be the zeros of $p_n$ and $p_n{(k)}$, the $k$th derivative of $p_n$, respectively. We show that if the linear statistics $\frac{1}{a_n} \left[ f\left( \frac {Z{(n)}_1}{b_n} \right)+ \cdots + f \left(\frac {Z{(n)}_n}{b_n} \right) \right]$ associated with ${Z{(n)}_j}$ has a limit as $n\to\infty$ at some mode of convergence, the linear statistics associated with ${X{n, k}_j}$ converges to the same limit at the same mode. Similar statement also holds for the centered linear statistics associated with the zeros of $p_n$ and $p_n{(k)}$, provided the zeros ${Z{(n)}_j}$ and the sequences ${a_n}$ and ${b_n}$ of positive numbers satisfy some mild conditions.

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