Science

Permanent URI for this communityhttps://hdl.handle.net/11693/115484

Browse

Browsing Science by Subject "04.20.Gz"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • Thumbnail Image
    ItemOpen Access
    On a particular type of product manifolds and shear-free cosmological models
    (Institute of Physics Publishing, 2011) Gürses M.; Plaue, M.; Scherfner, M.
    Shear-free flows or observer fields are important objects of study in general relativity; stationary or rigid observers are important examples of shear-free reference frames. In this paper, we introduce a geometric structure based on a local coordinate expression of metrics admitting a shear-free reference frame. Furthermore, we investigate a large sub-class of these models ('tilted' warped products) that includes the Robertson-Walker spacetime, the Gödel spacetime and other models of Gödel type. We present a novel example of a rotating and expanding cosmological model that is contained in this class. Finally, we describe the geodesic barotropic perfect fluid solutions. © 2011 IOP Publishing Ltd.