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hal-00001526, version 1

Real quadrics in $\Bbb C^n$, complex manifolds and convex polytopes

Frédéric Bosio () 1, Laurent Meersseman () 2

Résumé : In this paper, we investigate the topology of a class of non-Kähler compact complex manifolds generalizing that of Hopf and Calabi-Eckmann manifolds. These manifolds are diffeomorphic to special systems of real quadrics in $\Bbb C^n$ which are invariant with respect to the natural action of the real torus $(\Bbb S^1)^n$ onto $\Bbb C^n$. The quotient space is a simple convex polytope. The problem reduces thus to the study of the topology of certain real algebraic sets and can be handled using combinatorial results on convex polytopes. We prove that the homology groups of these compact complex manifolds can have arbitrary amount of torsion so that their topology is extremely rich. We also resolve an associated wall-crossing problem by introducing holomorphic equivariant elementary surgeries related to some transformations of the simple convex polytope. Finally, as a nice consequence, we obtain that affine non Kähler compact complex manifolds can have arbitrary amount of torsion in their homology groups, contrasting with the Kähler situation.

  • 1 :  Laboratoire de Mathématiques et Applications (LMA-Poitiers)
  • Université de Poitiers – CNRS : UMR7348
  • 2 :  Institut de Recherche Mathématique de Rennes (IRMAR)
  • CNRS : UMR6625 – Université de Rennes 1 – École normale supérieure de Cachan - ENS Cachan – Institut National des Sciences Appliquées (INSA) : - RENNES – Université de Rennes II - Haute Bretagne
  • Domaine : Mathématiques/Topologie géométrique
  • Mots-clés : topology of non-Kähler compact complex manifolds – affine complex manifolds – combinatorics of convex polytopes – real quadrics – equivariant surgery – subspace arrangements
  • Référence interne : 2004-30
 
  • hal-00001526, version 1
  • oai:hal.archives-ouvertes.fr:hal-00001526
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  • Soumis le : Mercredi 5 Mai 2004, 16:19:29
  • Dernière modification le : Mardi 23 Mars 2010, 14:49:45