%0 Journal Article
%T Double scaling limit for modified Jacobi-Angelesco polynomials
%A Klaas Deschout
%A Arno B. J. Kuijlaars
%J Mathematics
%D 2011
%I arXiv
%X We consider multiple orthogonal polynomials with respect to two modified Jacobi weights on touching intervals [a,0] and [0,1], with a < 0, and study a transition that occurs at a = -1. The transition is studied in a double scaling limit, where we let the degree n of the polynomial tend to infinity while the parameter a tends to -1 at a rate of O(n^{-1/2}). We obtain a Mehler-Heine type asymptotic formula for the polynomials in this regime. The method used to analyze the problem is the steepest descent technique for Riemann-Hilbert problems. A key point in the analysis is the construction of a new local parametrix.
%U http://arxiv.org/abs/1102.1349v1