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Transversal Twistor Spaces of Foliations
Authors:Izu Vaisman
Institution:(1) Department of Mathematics, University of Haifa, Mount Carmel, 31905 Haifa, Israel
Abstract:The transversal twistor space of a foliation 
$$F$$
of an even codimension is the bundle 
$$Z(F)$$
of the complex structures of the fibers of the transversalbundle of 
$$F$$
. On 
$$Z(F)$$
there exists a foliation 
$$\hat F$$
by covering spaces of the leaves of 
$$F$$
, and any Bottconnection of 
$$F$$
produces an ordered pair 
$$(\ell _1 ,\ell _2 )$$
of transversal almost complex structures of 
$$\hat F$$
. The existence of a Bott connection which yields a structure 
$$\ell $$
1 that is projectable to the space of leaves isequivalent to the fact that 
$$F$$
is a transversallyprojective foliation. A Bott connection which yields a projectablestructure 
$$\ell $$
2 exists iff 
$$F$$
isa transversally projective foliation which satisfies a supplementarycohomological condition, and, in this case, 
$$\ell $$
1is projectable as well. 
$$\ell $$
2 is never integrable.The essential integrability condition of 
$$\ell $$
1 isthe flatness of the transversal projective structure of 
$$F$$
.
Keywords:foliated (projectable) objects  foliations  transversal twistor spaces
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