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Proceedings of the American Mathematical Society
Proceedings of the American Mathematical Society
ISSN 1088-6826(e) ISSN 0002-9939(p)

     

The normal homogeneous space ${\bigl(\mathsf{SU}(3)\times\mathsf{SO}(3)\bigr)/ \mathsf{U}^{\bullet}(2)}$ has positive sectional curvature

Author(s): Burkhard Wilking
Journal: Proc. Amer. Math. Soc. 127 (1999), 1191-1194.
MSC (1991): Primary 53C30, 53C25
MathSciNet review: 1469441
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Abstract | References | Similar articles | Additional information

Abstract: We give a new description of the positively curved seven-dimensional Aloff-Wallach spaces $M^7_{kl}$. In particular, this description exhibits $M^7_{11}$ as a normal homogeneous space, although it does not occur in Berger's classification (1961).


References:

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L. Bérard Bergery, Sur certaines fibrations d'espaces homogènes riemanniens, Compositio Mathematica 30 (1975), 43-61. MR 51:6659
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L. Bérard Bergery, Les variétés riemanniennes homogènes simplement connexes de dimension impaire à courbure strictement positive, J. Math. pure et appl. 55(1976), 47-68. MR 54:6032
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M. Berger, Les variétés riemanniennes homogènes normales simplement connexes à Courbure strictement positive, Ann. Scuola Norm. Sup. Pisa 15(1961), 179-246. MR 24:A2919
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H. Eliasson, Die Krümmung des Raumes $\mathsf{Sp}(2)/\mathsf{SU}(2)$ von Berger, Math. Annalen 164 (1966), 317-323. MR 33:4866
[1971]
E. Heintze, The curvature of $\mathsf{SU}(5)/\bigl(\mathsf{Sp}(2)\times \mathsf{S}^1\bigr)$, Invent. Math. 13 (1971), 205-212. MR 45:2610
[1997]
T. Püttmann, Pinching constants of odd-dimensional homogeneous spaces, preprint (1997).
[W1972]
N. Wallach, Compact homogeneous Riemannian manifolds with strictly positive curvature, Ann. of Math. 96 (1972), 277-295. MR 46:6243


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Additional Information:

Burkhard Wilking
Affiliation: Westfälische Wilhelms--Universität Einsteinstr.~62 48149 Münster Germany
Email: wilking@math.uni-muenster.de

DOI: 10.1090/S0002-9939-99-04613-4
PII: S 0002-9939(99)04613-4
Keywords: Normal homogeneous spaces, positive sectional curvature
Received by editor(s): March 11, 1997
Received by editor(s) in revised form: July 9, 1997
Communicated by: Christopher Croke
Copyright of article: Copyright 1999, American Mathematical Society




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