2.d Cosmological Models with Rotation

This line of research considers cosmological models with rotation. From the original papers of K. Godel we examined the possible free paths in such geometries (M.Novello, I.D.Soares e J.Tiomno, Physical Review D 27¸4, 779, 1983) and the processes that forbid the construction of a global gaussian coordinate system in such geometries. Afterwards, localized gaussian systems were constructed (M.Novello, N.F.Svaiter e M.E.X.Guimarães, General Relativity and Gravitation 25, 2, 1993) and timelike curves for material bodies were obtained (M.Novello, N.F.Svaiter e M.E.X.Guimarães, Modern Physics Letters A 7, 5, 1992). As a consequence of this research, causal protection capsules were constructed (M.Novello e M.C.Motta da Silva, Physical Review D 49, 2, 825, 1994 - M.Novello e M.C.Motta da Silva, Physical Review D 48, 10, 5017, 1993). The aim of this approach was to produce universes with limited regions with rotation and without closed timelike curves. A small modification of such schemes can produce structures with the features of a wormhole.