Hyperheavenly spaces and their application in Walker and para-Kähler geometries: Part I
arXiv:2107.09093 · doi:10.1016/j.geomphys.2022.104591
Abstract
Spaces equipped with congruences of null strings are considered. A special attention is paid to the spaces which belong to the two-sided Walker class and para-Kähler class. Properties of an intersection of self-dual and anti-self-dual congruences of null strings are used as an additional criterion for a classification of such spaces. Finally, a few examples of para-Kähler and para-Kähler-Einstein spaces are presented.
Minor changes have been provided