Mathematics > Algebraic Geometry
[Submitted on 29 Dec 2018 (v1), last revised 17 Apr 2020 (this version, v4)]
Title:Codimension one distributions and stable rank 2 reflexive sheaves on threefolds
View PDFAbstract:We show that codimension one distributions with at most isolated singularities on certain smooth projective threefolds with Picard rank one have stable tangent sheaves. The ideas in the proof of this fact are then applied to the characterization of certain irreducible components of the moduli space of stable rank 2 reflexive sheaves on $\mathbb{P}^3$, and to the construction of stable rank 2 reflexive sheaves with prescribed Chern classes on general threefolds. We also prove that if $\mathscr{G}$ is a subfoliation of a codimension one distribution $\mathscr{F}$ with isolated singularities, then $Sing(\mathscr{G})$ is a curve. As a consequence, we give a criterion to decide whether $\mathscr{G}$ is globally given as the intersection of $\mathscr{F}$ with another codimension one distribution. Turning our attention to codimension one distributions with non isolated singularities, we determine the number of connected components of the pure 1-dimensional component of the singular scheme.
Submission history
From: Maurício Corrêa [view email][v1] Sat, 29 Dec 2018 12:48:38 UTC (12 KB)
[v2] Fri, 4 Jan 2019 14:31:14 UTC (14 KB)
[v3] Fri, 3 May 2019 14:11:48 UTC (14 KB)
[v4] Fri, 17 Apr 2020 14:24:06 UTC (15 KB)
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