A thin stringy moduli space for Slodowy slices

Details A thin stringy moduli space for Slodowy slices A thin stringy moduli space for Slodowy slices

2011-08-07

arxiv.org/abs/1108.1563v3

Mathematics

Algebraic Geometry

9 pages; more minor corrections and a slight expansion

Scientific paper

We provide examples of an explicit submanifold in Bridgeland stabilities space of a local Calabi-Yau, and propose a new variant of definition of stabilities on a triangulated category, which we call a "real variation of stability conditions". We discuss its relation to Bridgeland's definition; the main theorem provides an illustration of such a relation. More precisely, let X be the standard resolution of a transversal slice to an adjoint nilpotent orbit of a simple Lie algebra over C. An action of the affine braid group on the derived category D^b(Coh(X)) and a collection of t-structures on this category permuted by the action have been constructed in arXiv:1101.3702 and arXiv:1001.2562 respectively. In this note we show that the t-structures come from points in a certain connected submanifold in the space of Bridgeland stability conditions. The submanifold is a covering of a submanifold in the dual space to the Grothendieck group, and the affine braid group acts by deck transformations. In the special case when dim (X)=2 a similar (in fact, stronger) result was obtained in arXiv:math/0508257. The dimension of our subset equals (in most cases) that of the second cohomology of X, so it may deserve the name of stringy moduli space; it is in a sense smaller than one may want, hence the attribute "thin".

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