On the configuration of the singular fibers of jet schemes of rational double points

Abstract

To each variety X and a nonnegative integer m, there is a space Xm over X, called the jet scheme of X of order m, parametrizing m-th jets on X. Its fiber over a singular point of X is called a singular fiber. For a surface with a rational double point, Mourtada gave a one-to-one correspondence between the irreducible components of the singular fiber of Xm and the exceptional curves of the minimal resolution of X for In this article, for a surface X over with a singularity of An or D 4-type, we study the intersections of irreducible components of the singular fiber and construct a graph using this information. The vertices of the graph correspond to irreducible components of the singular fiber and two vertices are connected when the intersection of the corresponding components is maximal for the inclusion relation. In the case of An or D 4-type singularity, we show that this graph is isomorphic to the resolution graph for