Contact Metric Spaces and pseudo-Hermitian Symmetry

Abstract

We prove that a contact strongly pseudo-convex CR (Cauchy–Riemann) manifold M2n+1, n≥2, is locally pseudo-Hermitian symmetric and satisfies ∇ξh=μhϕ, μ∈R, if and only if M is either a Sasakian locally ϕ-symmetric space or a non-Sasakian (k,μ)-space. When n=1, we prove a classification theorem of contact strongly pseudo-convex CR manifolds with pseudo-Hermitian symmetry.

Keywords

• contact almost CR (Cauchy–Riemann) manifold
• generalized Tanaka-Webster connection
• pseudo-Hermitian symmetric space