AbstractIn this talk, we will focus on Sp/SO Hitchin systems on marked curves with residues of Higgsfields lying in special nilpotent orbit closures which are related by the Springer correspondence. Wewill first show how to resolve singularities of generic spectral curves using Spaltenstein'sdescription of Kazhdan-Lusztig maps for classical groups via characteristic polynomials. Then wewill dis...
Fano fourfolds with large anticanonical base locusA famous theorem of Shokurov states that a general anticanonical divisor of a smooth Fano threefold is a smooth K3 surface. This is quite surprising since there are several examples where the base locus of the anticanonical system has codimension two. In this paper we show that for four-dimensional Fano manifolds the behaviour is completely oppo...