ON CONFORMALLY FLAT AND TYPE N PURE RADIATION METRICS

In our paper¹ we investigated pure radiation spacetimes of algebraic types O and N with a possible cosmological constant. In particular, we presented explicit transformations which put these metrics, that were recently re-derived by Edgar, Vickers and Machado Ramos using the GIF method, into a general Ozsváth–Robinson–Rózga form. By putting all such Kundt metrics into the unified coordinate system we confirmed that their rigorous derivation is correct and enables a physical interpretation to be performed.