Geometric structures associated with a contact metric $(κ,μ)$-space

Details Geometric structures associated with a contact metric $(κ,μ)$-space Geometric structures associated with a contact metric $(κ,μ)$-space

2010-03-06

arxiv.org/abs/1003.1416v1

Mathematics

Differential Geometry

To appear on: Pacific Journal of Mathematics

Scientific paper

We prove that any contact metric $(\kappa,\mu)$-space $(M,\xi,\phi,\eta,g)$ admits a canonical paracontact metric structure which is compatible with the contact form $\eta$. We study such canonical paracontact structure, proving that it verifies a nullity condition and induces on the underlying contact manifold $(M,\eta)$ a sequence of compatible contact and paracontact metric structures verifying nullity conditions. The behavior of that sequence, related to the Boeckx invariant $I_M$ and to the bi-Legendrian structure of $(M,\xi,\phi,\eta,g)$, is then studied. Finally we are able to define a canonical Sasakian structure on any contact metric $(\kappa,\mu)$-space whose Boexkx invariant satisfies $|I_M|>1$.

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