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arxiv: math-ph/0309014 · v4 · submitted 2003-09-04 · 🧮 math-ph · cond-mat· math.MP· nlin.CD

Real roots of Random Polynomials: Universality close to accumulation points

classification 🧮 math-ph cond-matmath.MPnlin.CD
keywords realrootsaccumulationcoefficientspointspolynomialsrandomregion
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We identify the scaling region of a width O(n^{-1}) in the vicinity of the accumulation points $t=\pm 1$ of the real roots of a random Kac-like polynomial of large degree n. We argue that the density of the real roots in this region tends to a universal form shared by all polynomials with independent, identically distributed coefficients c_i, as long as the second moment \sigma=E(c_i^2) is finite. In particular, we reveal a gradual (in contrast to the previously reported abrupt) and quite nontrivial suppression of the number of real roots for coefficients with a nonzero mean value \mu_n = E(c_i) scaled as \mu_n\sim n^{-1/2}.

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