We show that, for any given q >= 0 , any Sasakian structure on a closed manifold M is approximated in the C^q norm by structures induced by CR embeddings into weighted Sasakian spheres. In order to obtain this result, we also strengthen the approximation of an orbifold Kähler form by projectively induced ones given in [J. Ross and R. Thomas, Weighted projective embeddings, stability of orbifolds, and constant scalar curvature Kähler metrics, J. Differential Geom. 88 2011, 1, 109-159] in the C^0-norm to a C^q-approximation.
Any Sasakian structure is approximated by embeddings into spheres
Loi, Andrea;Placini, Giovanni
2024-01-01
Abstract
We show that, for any given q >= 0 , any Sasakian structure on a closed manifold M is approximated in the C^q norm by structures induced by CR embeddings into weighted Sasakian spheres. In order to obtain this result, we also strengthen the approximation of an orbifold Kähler form by projectively induced ones given in [J. Ross and R. Thomas, Weighted projective embeddings, stability of orbifolds, and constant scalar curvature Kähler metrics, J. Differential Geom. 88 2011, 1, 109-159] in the C^0-norm to a C^q-approximation.
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