K. Nakamoto | Searcharxiv

arXiv2017

Triple Root Systems, Quasi-determinantal Quivers and Linear Free Divisors

We start by constructing a new root system for rational triple singularities and determine the number of roots for each rational triple singularity. Then we show that, for each root, we obtain a linear free divisor. So we obtain a new family of linear free divisors. This gives the converse part of an existing theorem which says, by using the quiver representation, that linear free divisors come from a tree. We prove that our construction is independent of the orientation on the rational triple trees. Furthermore, we deduce that linear free divisors defined by rational triple quivers satisfy the logarithmic comparison theorem. In last section, we generalize the results of these results to rational quasi-determinantal singularities.

math.AG↗

arXiv2012

A new construction of $\tilde{D}_5$-singularities and generalization of Slodowy slices

Any simple elliptic singularity of type $\tilde{D}_5$ can be obtained by taking the intersection of the nilpotent variety and the 4-dimensional "good slices" in the semi-simple Lie algebra ${\frak sl}(2, {\mathbb C}) \oplus {\frak sl}(2, {\mathbb C})$. We describe these new slices purely by the structure of the Lie algebra. We also construct the semi-universal deformation spaces of $\tilde{D}_5$-singularities by using the 4-dimensional "good slices".

math.AG↗