The center of modular shifted Yangians and parabolic generators

Abstract

This paper is devoted to the study of the shifted Yangian $Y_n(\sigma )$ associated to the general linear Lie algebra ${\mathfrak{gl}}_n$ over a field of positive characteristic. We obtain an explicit description of the center $Z(Y_n(\sigma ))$ of $Y_n(\sigma )$ in terms of parabolic generators, showing that it is generated by its Harish-Chandra center and its $p$-center.

final version, to appear in J. Algebra