Abstract
We study extremal contractions from smooth projective varieties via a moduli theoretic approach. In the two dimensional case, we show that any extremal contraction appears as a moduli space of Bridgeland stable objects in the derived category of coherent sheaves. In the three dimensional case, we show that a a similar result holds with respect to conjectural Bridgeland stability conditions.
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Notes
The notion of S-equivalence is a direct analogue used in the study of moduli of sheaves. See Definition 2.2.
This means that \(\mathcal{P }_{B, f^{*}\omega }(1)\) is a noetherian and artinian abelian category.
A stability condition in Definition 2.1 was called numerical stability condition in [11]. We omit ‘numerical’ since we do not deal with non-numerical stability conditions.
The locally finiteness of \(\sigma _0\) is obvious since the image of \(Z_{f^{*}\omega }\) is a discrete subgroup.
This was denoted by \(\mathop {^{{p}}{\mathrm{Per}}}\nolimits (X/\fancyscript{A}_0)\) in [33].
Here we use the different perversity from the surface case.
Kawamata informed the author that he later proved the minimality of \(\mathcal{D }_Y\).
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Acknowledgments
The author is grateful to Arend Bayer for valuable comments. The proof of Proposition 3.13 is benefited by the communication with Emanuele Macri. This work is supported by World Premier International Research Center Initiative (WPI initiative), MEXT, Japan. This work is also supported by Grant-in Aid for Scientific Research grant (22684002), and partly (S-19104002), from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Dedicated to Professor Yujiro Kawamata on the occasion of his 60-th birthday.
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Toda, Y. Stability conditions and extremal contractions. Math. Ann. 357, 631–685 (2013). https://doi.org/10.1007/s00208-013-0915-4
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DOI: https://doi.org/10.1007/s00208-013-0915-4