Random matrix theory and the zeros of ζ ′ ( s )

Abstract. We study the density of the roots of the derivative of the characteristic polynomial Z(U, z) of an N × N random unitary matrix with distribution given by Haar measure on the unitary group. Based on previous random matrix theory models of the Riemann zeta function ζ(s), this is expected to be an accurate description for the horizontal distribution of the zeros of ζ (s) to the right of the critical line. We show that as N → ∞ the fraction of the roots of Z (U, z) that lie in the region 1 − x/(N − 1) ≤ |z| < 1 tends to a limit function. We derive asymptotic expressions for this function in the limits x → ∞ and x → 0 and compare them with numerical experiments.