Edge universality of $β$-additions through Dunkl operators

Abstract: It is well known that the edge limit of Gaussian/Laguerre Beta ensembles is given by Airy($\beta$) point process. We prove an universality result that this also holds for a general class of additions of Gaussian and Laguerre ensembles. In order to make sense of $\beta$-addition, we introduce type A Bessel function as the characteristic function of our matrix ensemble following the line of Gorin-Marcus, Benaych Georges-Cuenca-Gorin. Then we extract its moment information through the action of Dunkl operators, a class of differential operators originated from special function theory. We do the action explicitly on the Bessel generating functions of our additions, and after the asymptotic analysis, we obtain certain limiting functional in terms of conditional Brownian bridges of the Laplace transform of Airy($\beta$), which is universal up to proper rescaling among all our additions.