• Citer

On twistor almost complex structures

par Cahen, Michel ;Gutt, Simone ;Rawnsley, John
Référence Journal of Geometric Mechanics, 13, 3, page (313-331)
Publication Publié, 2021-09-01

Article révisé par les pairs

• Accès en ligne
• Détails
• Contenu
• Statistiques

Résumé :

In this paper we look at the question of integrability, or not, of the two natural almost complex structures J∇± defined on the twistor space J(M, g) of an even-dimensional manifold M with additional structures g and ∇ a g-connection. We measure their non-integrability by the dimension of the span of the values of NJ∇±. We also look at the question of the compatibility of J∇± with a natural closed 2-form ωJ(M,g,∇) defined on J(M, g). For (M, g) we consider either a pseudo-Riemannian manifold, orientable or not, with the Levi Civita connection or a symplectic manifold with a given symplectic connection ∇. In all cases J(M, g) is a bundle of complex structures on the tangent spaces of M compatible with g. In the case M is oriented we require the orientation of the complex structures to be the given one. In the symplectic case the complex structures are positive.