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The Sasakian geometry of the Heisenberg group

By Charles P. Boyer


Abstract. In this note I study the Sasakian geometry associated to the standard CR structure on the Heisenberg group, and prove that the Sasaki cone coincides with the set of extremal Sasakian structures. Moreover, the scalar curvature of these extremal metrics is constant if and only if the metric has Φ-sectional curvature −3. I also briefly discuss some relations with the well-know sub-Riemannian geometry of the Heisenberg group as well as the standard Sasakian structure induced on compact quotients. Dedicated to Professor S. Ianus on the occasion of his 70th Birthday 1

Year: 2011
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