Moduli spaces of lie algebras and foliations

Author:

Velazquez Sebastián

Abstract

Let X X be a smooth projective variety over the complex numbers and S ( d ) S(d) the scheme parametrizing d d -dimensional Lie subalgebras of H 0 ( X , T X ) H^0(X,\mathcal {T}X) . This article is dedicated to the study of the geometry of the moduli space Inv \text {Inv} of involutive distributions on X X around the points F Inv \mathcal {F}\in \text {Inv} which are induced by Lie group actions. For every g S ( d ) \mathfrak {g}\in S(d) one can consider the corresponding element F ( g ) Inv \mathcal {F}(\mathfrak {g})\in \text {Inv} , whose generic leaf coincides with an orbit of the action of exp ( g ) \exp (\mathfrak {g}) on X X . We show that under mild hypotheses, after taking a stratification i S ( d ) i S ( d ) \coprod _i S(d)_i\to S(d) this assignment yields an isomorphism ϕ : i S ( d ) i Inv \phi :\coprod _i S(d)_i\to \text {Inv} locally around g \mathfrak {g} and F ( g ) \mathcal {F}(\mathfrak {g}) . This gives a common explanation for many results appearing independently in the literature. We also construct new stable families of foliations which are induced by Lie group actions.

Funder

Consejo Nacional de Investigaciones Científicas y Técnicas

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference18 articles.

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4. Irreducible components of the space of holomorphic foliations of degree two in 𝐂𝐏(𝐧), 𝐧≥3;Cerveau, D.;Ann. of Math. (2),1996

5. Stability of holomorphic foliations with split tangent sheaf;Cukierman, Fernando;Amer. J. Math.,2008

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