The main purpose of this note is to construct almost complex or complex structures on certain isoparametric hypersurfaces in unit spheres. As a consequence, complex structures on S1×S7×S6, and on S1×S3×S2 with vanishing first Chern class, are built.
Zizhou TANG
,
Wenjiao YAN
. ISOPARAMETRIC HYPERSURFACES AND COMPLEX STRUCTURES[J]. Acta mathematica scientia, Series B, 2022
, 42(6)
: 2223
-2229
.
DOI: 10.1007/s10473-022-0603-0
[1] Brieskorn E, van de Ven A. Some complex structures on products of homotopy spheres. Topology, 1968, 7: 389-393
[2] Cecil T E, Chi Q S, Jensen G R. Isoparametric hypersurfaces with four principal curvatures. Ann Math, 2007, 166(1): 1-76
[3] Calabi E, Eckmann B. A class of compact, complex manifolds which are not algebraic. Ann Math, 1953, 58: 494-500
[4] Chern S S. Complex Manifolds without Potential Theory. 2nd ed. New York, Heidelberg: Springer-Verlag, 1979
[5] Chi Q S. Isoparametric hypersurfaces with four principal curvatures, III. J Differential Geom, 2013, 94: 469-504
[6] Chi Q S. Isoparametric hypersurfaces with four principal curvatures, IV. J Differential Geom, 2020, 115: 225-301
[7] Ferus D, Karcher H, Münzner H F. Cliffordalgebren und neue isoparametrische Hyperflächen. Math Z, 1981, 177: 479-502
[8] Immervoll S. On the classification of isoparametric hypersurfaces with four distinct principal curvatures in spheres. Ann Math, 2008, 168: 1011-1024
[9] Miyaoka R. Geometry of G2 orbits and isoparametric hypersurfaces. Nagoya Math J, 2011, 203: 175-189
[10] Miyaoka R. Isoparametric hypersurfaces with (g, m) = (6, 2). Ann Math, 2013, 177: 53-110; Ann Math, 2016, 183: 1057-1071
[11] Peng C K, Tang Z Z. Integrability condition on an almost complex structure and its application. Acta Math Sin (Engl Ser), 2005, 21: 1459-1464
[12] Qian C, Tang Z Z, Yan W J. Topology and curvature of isoparametric families in spheres. Comm Math Statis, DOI:10.1007/s40304-021-00259-2
[13] Tang Z Z. Curvature and integrability of an almost Hermitian structure. Int J Math, 2006, 17: 97-105
[14] Ueno K. Classification Theory of Algebraic Varieties and Compact Complex Spaces. Lecture Notes in Mathematics, Vol 439. Berlin, New York: Springer-Verlag, 1975
[15] Wang Q M. On the topology of Clifford isoparametric hypersurfaces. J Differential Geom, 1988, 27: 55-66