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Pacific Journal of Mathematics
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Holomorphic foliations and deformations of the Hopf foliation

Authors: Duchamp, T.; Kalka, M.;

Holomorphic foliations and deformations of the Hopf foliation

Abstract

A deformation theory for transversally holomorphic foliations is developed here and used to give an explicit description of the transver- sally holomorphic foliations near the "Hopf foliations" on odd dimen- sional spheres. Introduction. In (1) and (2) we began the study of the deformation theory of holomorphic foliations on a smooth compact manifold. Our aim was to construct a reasonably explicit parameterization of a neighborhood of a fixed holomoφhic foliation % in the space of all foliations by generalizing Kuranishi's theorem on deformations of complex structures on compact complex manifolds. However, in (1) we assumed the existence of a smooth foliation ψ- transverse to the foliation %. The purpose of the present paper is to eliminate this rather artificial assumption. In (3) Gomez-Mont observed that the Kodaira-Spencer machine can be used to show the existence of such a parameterizati on by an analytic subset of a finite dimensional vector space. However, as is the case for the deforma- tion theory of complex structures, the proof is rather abstract and is not easily adapted to computations. To illustrate our results, we present here a classification of all holomoφhic foliations near the foliation given by the Hopf fibration S2n+X -* CP n. We shall now give a more precise statement of our results. The reader is assumed to be somewhat familiar with the notations and results of (1); but we begin with a short review. Let % be a fixed holomorphic foliation of real codimensions 2q on the smooth, compact, oriented manifold Mn, i.e., % is given locally by smooth submersions into Cq which patch together via local biholomoφhisms of Cq. Let L C TM and Q — TM/L be the (real) tangent and normal bundles of % and fix once and for all a splitting TM — Lθ Q and a Riemannian metric on M respecting it. (In (1) this splitting was assumed to be induced by a transverse foliation. This is not necessarily the case here.) The complex structure map on Q induces a splitting of the complexified normal bundle in the standard way, Qc = <2(10) θ β (01) and there is a split exact sequence r P

Keywords

32G05, Complex manifolds, deformations of the Hopf foliation, 58H15, Deformations of special (e.g., CR) structures, 57R30, holomorphic foliations, Deformations of general structures on manifolds, existence of a Kuranishki space for holomorphic foliations, Foliations in differential topology; geometric theory

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
7
Average
Top 10%
Average
Green
bronze