Department of Mathematics Calendar
Nicholas Cook, Duke University, Universality for the minimum modulus of random trigonometric polynomials
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We consider the restriction to the unit circle of random degree-n polynomials with iid coefficients (Kac polynomials). Recent work of Yakir and Zeitouni shows that for Gaussian coefficients, the minimum modulus (suitably rescaled) follows a limiting exponential distribution. We show this is a universal phenomenon, extending their result to arbitrary sub-Gaussian coefficients, such as Rademacher signs. Our approach relates the joint distribution of small values at several angles to that of a random walk in high-dimensional phase space, for which we obtain strong central limit theorems. The case of discrete coefficients is particularly challenging as the distribution is then sensitive to arithmetic structure among the angles. Based on joint work with Hoi Nguyen.
Zoom ID: 939 3643 7199 (opens 15 min prior to the meeting)