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math.DG2020★ 1 cited
Lorentzian manifolds with shearfree congruences and Kähler-Sasaki geometry
Dmitri V. Alekseevsky, Masoud Ganji, Gerd Schmalz +1
We study Lorentzian manifolds of dimension , equipped with a maximally twisting shearfree null vector field , for which the leaf space …
math.DG2020
Quasi-Einstein shearfree spacetimes lifted from Sasakian manifolds
Masoud Ganji, Gerd Schmalz, Daniel Sykes
In this article we prove that a certain class of {\it smooth} Sasakian manifolds admits lifts to 4-dimensional quasi-Einstein shearfree spacetimes of Petrov type II or D. This is r…