Abstract
Let Q be a quiver with dimension vector α prehomogeneous under the action of the product of general linear groups GL(α) on the representation variety Rep(Q,α). We study geometric properties of zero sets of semi-invariants of this space. It is known that for large numbers N, the nullcone in Rep(Q,N⋅α) becomes a complete intersection. First, we show that it also becomes reduced. Then, using Bernstein–Sato polynomials, we discuss some criteria for zero sets to have rational singularities. In particular, we show that for Dynkin quivers codimension 1 orbit closures have rational singularities.
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