Abstract
We develop a theory of Bridgeland stability conditions and moduli spaces of semistable objects for a family of varieties. Our approach is based on and generalizes previous work by Abramovich–Polishchuk, Kuznetsov, Lieblich, and Piyaratne–Toda. Our notion includes openness of stability, semistable reduction, a support property uniformly across the family, and boundedness of semistable objects. We show that such a structure exists whenever stability conditions are known to exist on the fibers.
Our main application is the generalization of Mukai’s theory for moduli spaces of semistable sheaves on K3 surfaces to moduli spaces of Bridgeland semistable objects in the Kuznetsov component associated to a cubic fourfold. This leads to the extension of theorems by Addington–Thomas and Huybrechts on the derived category of special cubic fourfolds, to a new proof of the integral Hodge conjecture, and to the construction of an infinite series of unirational locally complete families of polarized hyperkähler manifolds of K3 type.
Other applications include the deformation-invariance of Donaldson–Thomas invariants counting Bridgeland stable objects on Calabi–Yau threefolds, and a method for constructing stability conditions on threefolds via degeneration.
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A. B. was supported by the ERC Starting Grant ERC-2013-StG-337039-WallXBirGeom, by the ERC Consolidator Grant ERC-2018-CoG-819864-WallCrossAG, and by the NSF Grant DMS-1440140 while the author was in residence at the MSRI in Berkeley, during the Spring 2019. M. L. was supported by a Ramón y Cajal fellowship and partially by the Spanish MINECO research project PID2019-104047GB-I00. E. M. was partially supported by the NSF grant DMS-1700751, by a Poincaré Chair from the Institut Henri Poincaré and the Clay Mathematics Institute, by the Institut des Hautes Études Scientifiques (IHÉS), by a Poste Rouge CNRS at Université Paris-Sud, by the ERC Synergy Grant ERC-2020-SyG-854361-HyperK, and by the National Group for Algebraic and Geometric Structures, and their Applications (GNSAGA-INdAM). H. N. was partially supported by the NSF postdoctoral fellowship DMS-1606283, by the NSF RTG grant DMS-1246844, and by the NSF FRG grant DMS-1664215. A. P. was partially supported by the NSF postdoctoral fellowship DMS-1606460 and the NSF grant DMS-2002709. P. S. was partially supported by the ERC Consolidator Grant ERC-2017-CoG-771507-StabCondEn, by the research project PRIN 2017 “Moduli and Lie Theory”, and by research project FARE 2018 HighCaSt (grant number R18YA3ESPJ)
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Bayer, A., Lahoz, M., Macrì, E. et al. Stability conditions in families. Publ.math.IHES 133, 157–325 (2021). https://doi.org/10.1007/s10240-021-00124-6
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DOI: https://doi.org/10.1007/s10240-021-00124-6