Bogomolny-Prasad-Sommerfeld state counting in local obstructed curves from quiver theory and Seiberg duality

In this paper, we study the Bogomolny-Prasad-Sommerfeld (BPS) state counting in the geometry of local obstructed curve with normal bundle O circle plus O(-2). We find that the BPS states have a framed quiver description. Using this quiver description along with the Seiberg duality and the localization techniques, we can compute the BPS state indices in different chambers dictated by stability parameter assignments. This provides a well-defined method to compute the generalized Donaldson-Thomas invariants. This method can be generalized to other affine ADE quiver theories. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3364787]