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http://dx.doi.org/10.4134/JKMS.2013.50.2.231

ORTHOGONAL ALMOST COMPLEX STRUCTURES ON THE RIEMANNIAN PRODUCTS OF EVEN-DIMENSIONAL ROUND SPHERES  

Euh, Yunhee (Department of Mathematics Sungkyunkwan University)
Sekigawa, Kouei (Department of Mathematics Faculty of Science Niigata University)
Publication Information
Journal of the Korean Mathematical Society / v.50, no.2, 2013 , pp. 231-240 More about this Journal
Abstract
We discuss the integrability of orthogonal almost complex structures on Riemannian products of even-dimensional round spheres and give a partial answer to the question raised by E. Calabi concerning the existence of complex structures on a product manifold of a round 2-sphere and of a round 4-sphere.
Keywords
orthogonal complex structure; even-dimensional sphere; curvature identity; Ricci *-tensor;
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1 E. Calabi, Construction and properties of some 6-dimensional almost complex manifold, Trans. Amer. Math. Soc. 87 (1958), 407-438.
2 A. Gray, Curvature identities for Hermitian and almost Hermitian manifolds, Tohoku Math. J. 28 (1976), no. 4, 601-612.   DOI
3 H. Hashimoto, T. Koda, K. Mashimi, and K. Sekigawa, Extrinsic homogeneous almost Hermitian 6-dimensional submanifolds in the Octonions, Kodai Math. J. 30 (2007), no. 3, 297-321.   DOI
4 C. Lebrun, Orthogonal complex structures on $S^6$, Proc. Amer. Math. Soc. 101 (1987), no. 1, 136-138.
5 A. Newlander and L. Nirenberg, Complex analytic coordinates in almost complex mani- folds, Ann. of Math. 65 (1957), 391-404.   DOI
6 K. Sekigawa and L. Vanhecke, Almost Hermitian manifolds with vanishing first Chern class or Chern numbers, Rend. Sem. Mat. Univ. Politec. Torino 50 (1992), no 2, 195-208.
7 W. A. Sutherland, A note on almost complex and weakly complex structures, J. London Math. Soc. 40 (1965), 705-712.   DOI