Conformally Einstein Lorentzian Lie groups with Heisenberg symmetry
arXiv:2303.00646
Abstract
We describe all Lorentzian semi-direct extensions of the Heisenberg group which are conformally Einstein. As a by side result, Bach-flat left-invariant Lorentzian metrics on semi-direct extensions of the Heisenberg group are classified, thus providing new background solutions in conformal gravity.