The Dual Complex of a semi-log canonical Surface

Abstract

Semi-log canonical varieties are a higher-dimensional analogue of stable curves. They are the varieties appearing as the boundary $\Delta$ of a log canonical pair $(X,\Delta )$, and also appear as limits of canonically polarized varieties in moduli theory. For certain three-fold pairs $(X,\Delta )$ we show how to compute the PL homeomorphism type of the dual complex of a dlt minimal model directly from the normalization data of $\Delta$.