Gleiser, R. J.Gürses, M.Karasu, A.Sarioǧlu, Ö.2016-02-082016-02-0820060264-9381http://hdl.handle.net/11693/23817It is shown explicitly that when the characteristic vector field that defines a Gödel-type metric is also a Killing vector, there always exist closed timelike or null curves in spacetimes described by such a metric. For these geometries, the geodesic curves are also shown to be characterized by a lower-dimensional Lorentz force equation for a charged point particle in the relevant Riemannian background. Moreover, two explicit examples are given for which timelike and null geodesics can never be closed. © 2006 IOP Publishing Ltd.EnglishArticle10.1088/0264-9381/23/7/0251361-6382