Geodesic
New hyper-Käahler structures on tangent bundles
Communications in Mathematics, Tome 22 (2014) no. 1, pp. 13-30.

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Let $(M,g,J)$ be an almost Hermitian manifold, then the tangent bundle $TM$ carries a class of naturally defined almost hyper-Hermitian structures $(G,J_1,J_2,J_3)$. In this paper we give conditions under which these almost hyper-Hermitian structures $(G,J_1,J_2,J_3)$ are locally conformal hyper-Kähler. As an application, a family of new hyper-\kr structures is obtained on the tangent bundle of a complex space form. Furthermore, by restricting these almost hyper-Hermitian structures on the unit tangent sphere bundle $T_1 M$, we obtain a class of almost contact metric 3-structures. By virtue of these almost contact metric 3-structures, we find a family of Sasakian 3-structures on the unit tangent sphere bundle of a complex space form of positive holomorphic sectional curvature.
Classification : 53C15, 53C26
Keywords: tangent bundles; locally conformal hyper-Kähler structures; almost contact metric 3-structures; Sasakian 3-structures 
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     author = {Qi, Xuerong and Cao, Linfen and Li, Xingxiao},
     title = {New {hyper-K\"aahler} structures on tangent bundles},
     journal = {Communications in Mathematics},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/COMIM_2014__22_1_a1/}
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Qi, Xuerong; Cao, Linfen; Li, Xingxiao. New hyper-Käahler structures on tangent bundles. Communications in Mathematics, Tome 22 (2014) no. 1, pp. 13-30. http://geodesic.mathdoc.fr/item/COMIM_2014__22_1_a1/