4 papers · 1 filter
The Flat CR Twistor Model and Its Algebraic Sections
Amedeo Altavilla, Stefano Marini
We study the flat CR twistor model by explicit projective methods. Using the anti-holomorphic involution associated with the twistor fibration, w…
On contact and finitely Levi-nondegenerate CR algebras
Stefano Marini, Costantino Medori, Mauro Nacinovich
We study CR-manifolds of arbitrary CR codimension, mainly focusing on Levi and contact-nondegeneracy and depth. We investigate these and other invariants in the locally homogeneous…
On Homogeneous CR Manifolds of Arbitrary Order of Levi Nondegeneracy
Stefano Marini, Costantino Medori
This paper present homogeneous CR hypersurfaces satisfying the -invariant property of being -nondegenerate for an arbitrary integer . The construction of such homog…
Projectively induced Kähler cones over regular Sasakian manifolds
Stefano Marini, Nicoletta Tardini, Michela Zedda
Motivated by a conjecture in [9] we prove that the Kähler cone over a regular complete Sasakian manifold is Ricci-flat and projectively induced if and only if it is flat. We also…