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Series of rational moduli components of stable rank two vector bundles on \(\pmb {\mathbb {P}}^3\)

  • A. A. Kytmanov
  • A. S. TikhomirovEmail author
  • S. A. Tikhomirov


We study the problem of rationality of an infinite series of components, the so-called Ein components, of the Gieseker–Maruyama moduli space M(en) of rank 2 stable vector bundles with the first Chern class \(e=0\) or \(-1\) and all possible values of the second Chern class n on the projective space \({{\mathbb {P}}^{3}}\). We show that, in a wide range of cases, the Ein components are rational, and in the remaining cases they are at least stably rational. As a consequence, the union of the spaces M(en) over all \(n\ge 1\) contains new series of rational components in the case \(e=0\), exteding and improving previously known results of Vedernikov (Math USSSR-Izv 25:301–313, 1985) on series of rational families of bundles, and a first known infinite series of rational components in the case \(e=-\,1\). Explicit constructions of rationality (stable rationality) of Ein components are given. Our approach is based on the study of a correspondence between generalized null correlation bundles constituting open subsets of Ein components and certain rank 2 reflexive sheaves on \({{\mathbb {P}}^{3}}\). This correspondence is obtained via elementary transformations along surfaces. We apply the technique of Quot-schemes and universal spaces of extensions of sheaves to relate the parameter spaces of these two types of sheaves. In the case of rationality, we construct universal families of generalized null correlation bundles over certain open subsets of Ein components showing that these subsets are fine moduli spaces. As a by-product of our construction, for \(c_1=0\) and n even, they provide, perhaps the first known, examples of fine moduli spaces not satisfying the condition “n is odd”, which is a usual sufficient condition for fineness.


Rank 2 bundles Moduli of stable bundles Rational varieties 

Mathematics Subject Classification

14D20 14E08 14J60 



AAK was supported by the Russian Science Foundation under grant 18-71-10007. AST was supported by a subsidy to the HSE from the Government of the Russian Federation for the implementation of Global Competitiveness Program. AST also acknowledges the support from the Max Planck Institute for Mathematics in Bonn, where this work was partially done during the winter of 2017.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.School of Space and Information TechnologySiberian Federal UniversityKrasnoyarskRussia
  2. 2.Faculty of MathematicsNational Research University Higher School of EconomicsMoscowRussia
  3. 3.Department of Physics and MathematicsYaroslavl State Pedagogical UniversityYaroslavlRussia

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