Mini-walls for Bridgeland stability conditions on the derived category of sheaves over surfaces

Details Mini-walls for Bridgeland stability conditions on the derived category of sheaves over surfaces Mini-walls for Bridgeland stability conditions on the derived category of sheaves over surfaces

2011-03-22

arxiv.org/abs/1103.4352v1

Mathematics

Algebraic Geometry

26 pages

Scientific paper

For the derived category of bounded complexes of sheaves on a smooth projective surface, Bridgeland and Arcara-Bertram constructed Bridgeland stability conditions $(Z_m, \mathcal P_m)$ parametrized by $m \in (0, +\infty)$. In this paper, we show that the set of mini-walls in $(0, +\infty)$ of a fixed numerical type is locally finite. In addition, we strengthen a result of Bayer by proving that the moduli of polynomial Bridgeland semistable objects of a fixed numerical type coincides with the moduli of $(Z_m, \mathcal P_m)$-semistable objects whenever $m$ is larger than a universal constant depending only on the numerical type. We further identify the moduli of polynomial Bridgeland semistable objects with the Gieseker/Simpson moduli spaces and the Uhlenbeck compactification spaces.

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