On the Distribution of Complex Roots of Random Polynomials with Heavy-tailed Coefficients

preprint2011arXivOpen access

Abstract

Consider a random polynomial Gn(z)=ξnzn+...+ξ1z+ξ0G_n(z)=ξ_nz^n+...+ξ_1z+ξ_0 with i.i.d. complex-valued coefficients. Suppose that the distribution of log⁡(1+log⁡(1+∣ξ0∣))\log(1+\log(1+|ξ_0|)) has a slowly varying tail. Then the distribution of the complex roots of GnG_n concentrates in probability, as n→∞n\to\infty, to two centered circles and is uniform in the argument as n→∞n\to\infty. The radii of the circles are ∣ξ0/ξτ∣1/τ|ξ_0/ξ_τ|^{1/τ} and ∣ξτ/ξn∣1/(n−τ)|ξ_τ/ξ_n|^{1/(n-τ)}, where ξτξ_τ denotes the coefficient with the maximum modulus.

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