Conformal paracontact curvature and the local flatness theorem

Abstract

A curvature-type tensor invariant called para contact (pc) conformal curvature is defined on a paracontact manifold. It is shown that a paracontact manifold is locally paracontact conformal to the hyperbolic Heisenberg group or to a hyperquadric of neutral signature if and only if the pc conformal curvature vanishes. In the three dimensional case the corresponding result is achieved through employing a certain symmetric (0,2) tensor. The well known result of Cartan-Chern-Moser giving necessary and sufficient condition a CR-structure to be CR equivalent to a hyperquadric in the complex vector space is presented in-line with the paracontact case. An explicit formula for the regular part of a solution to the sub-ultrahyperbolic Yamabe equation on the hyperbolic Heisenberg group is shown.

18 pages, substantial clarification of the integrability condition in dimension 3 in both CR and para CR cases, CR-part shortened

References in corpus (2)

• Cones over pseudo-Riemannian manifolds and their holonomy
• Conformal quaternionic contact curvature and the local sphere theorem

Cited by in corpus (2)

• ParaSasakian manifolds with a constant paraholomorphic section curvature
• Conformal quaternionic contact curvature and the local sphere theorem