Hyper-ParaHermitian manifolds with torsion

Details Hyper-ParaHermitian manifolds with torsion Hyper-ParaHermitian manifolds with torsion

2004-05-31

arxiv.org/abs/math/0405585v2

J.Geom.Phys. 56 (2006) 670-690

Mathematics

Differential Geometry

latex, 20 pages, references clarified, final version, to appear in J. Goem. Phys

Scientific paper

Necessary and sufficient conditions for the existence of a hyper-parahermitian connection with totally skew-symmetric torsion (HPKT-structure) are presented. It is shown that any HPKT-structure is locally generated by a real (potential) function. An invariant first order differential operator is defined on any almost hyper-paracomplex manifold showing that it is two-step nilpotent exactly when the almost hyper-paracomplex structure is integrable. A local HPKT-potential is expressed in terms of this operator. Examples of (locally) invariant HPKT-structures with closed as well as non-closed torsion 3-form on a class of (locally) homogeneous hyperparacomplex manifolds (some of them compact) are constructed.

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