Lorentzian manifolds with shearfree congruences and Kähler-Sasaki geometry

Dmitri V. Alekseevsky, Masoud Ganji, Gerd Schmalz +1

We study Lorentzian manifolds $(M,g)$ of dimension $n\ge 4$, equipped with a maximally twisting shearfree null vector field $p_o$, for which the leaf space $S=M/\{\exp t{p}_o\}$…