On the Geometry of the Pappas–rapoport Models for Pel Shimura Varieties

Abstract In this article we study integral models of Shimura varieties, called Pappas–Rapoport splitting model, for ramified P. E. L. Shimira data. We study the special fiber and some stratification of these models, in particular we show that these are smooth and the Rapoport locus and the -ordinary locus are dense, under some condition on the ramification.