English

Random Sums of Weighted Orthogonal Polynomials in ${\mathbb C}^d$

Probability 2024-12-17 v1 Complex Variables

Abstract

We consider random polynomials of the form Gn(z):=αnξα(n)pn,α(z)G_n(z):= \sum_{|\alpha|\leq n} \xi^{(n)}_{\alpha}p_{n,\alpha}(z) where {ξα(n)}αn\{\xi^{(n)}_{\alpha}\}_{|\alpha|\leq n} are i.i.d. (complex) random variables and {pn,α}αn\{p_{n,\alpha}\}_{|\alpha|\leq n} form a basis for Pn\mathcal P_n, the holomorphic polynomials of degree at most nn in Cd{\mathbb C}^d. In particular, this includes the setting where {pn,α}\{p_{n,\alpha}\} are orthonormal in a space L2(e2nQτ)L^2(e^{-2n Q} \tau), where τ\tau is a compactly supported Bernstein-Markov measure and QQ is a continuous weight function. Under an optimal moment condition on the random variables {ξα(n)}\{\xi^{(n)}_{\alpha}\}, in dimension d=1d=1 we prove convergence in probability of the zero measure to the weighted equilibrium measure, and in dimension d2d \ge 2 we prove convergence of zero currents.

Keywords

Cite

@article{arxiv.2412.11969,
  title  = {Random Sums of Weighted Orthogonal Polynomials in ${\mathbb C}^d$},
  author = {T. Bloom and D. Dauvergne and N. Levenberg},
  journal= {arXiv preprint arXiv:2412.11969},
  year   = {2024}
}