Existence and Multiplicity results for the prescribed Webster Scalar Curvature Problem on three $C R $ manifolds

Details Existence and Multiplicity results for the prescribed Webster Scalar Curvature Problem on three $C R $ manifolds Existence and Multiplicity results for the prescribed Webster Scalar Curvature Problem on three $C R $ manifolds

2009-06-02

arxiv.org/abs/0906.0475v1

Mathematics

Differential Geometry

Scientific paper

This paper is devoted to the existence of contact forms of prescribed Webster scalar curvature on a $3-$dimensional CR compact manifold locally conformally CR equivalent to the unit sphere $\mathbb{S}^{3}$ of $\mathbb{C}^{2}$. Due to Kazdan-Warner type obstructions, conditions on the function $H$ to be realized as a Webster scalar curvature have to be given. We prove new existence results based on a new type of Euler-Hopf type formula. Our argument gives an upper bound on the Morse index of the obtained solution. We also give a lower bound on the number of conformal contact forms having the same Webster scalar curvature.

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