Four Possible Ways to Model a Rotating Universe

Abstract

It is known that most existing cosmology models do not include rotation, with few exceptions such as rotating Bianchi and rotating Godel metrics. Therefore, in this paper we aim to discuss four possible ways to model a rotating universe, including Nurgaliev’s Ermakov-type equation. It is our hope that the new proposed method can be verified with observations in order to open new possibilities of more realistic nonlinear cosmology models.