منابع مشابه
Stability of Closed Timelike Geodesics
The existence and stability under linear perturbations of closed timelike geodesics (CTG) in Bonnor-Ward spacetime is studied in some detail. Regions where the CTG exist and are linearly stable are exhibited. In 1949 Gödel found a solution to the Einstein field equation with nonzero cosmological constant that admits closed timelike curves (CTC) [1]. It could be argued that the Gödel solution is...
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Motivated by the rich geometry of conformal Riemannian manifolds and by the recent development of geometries modeled on homogeneous spaces G/P with G semisimple and P parabolic, Weyl structures and preferred connections are introduced in this general framework. In particular, we extend the notions of scales, closed and exact Weyl connections, and Rho–tensors, we characterize the classes of such...
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The geodesic deviation equation (‘GDE’) provides an elegant tool to investigate the timelike, null and spacelike structure of spacetime geometries. Here we employ the GDE to review these structures within the Friedmann–Lemâıtre–Robertson–Walker (‘FLRW’) models, where we assume the sources to be given by a non-interacting mixture of incoherent matter and radiation, and we also take a non-zero co...
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It is generally assumed that naked singularities must be physically excluded, as they could otherwise introduce unpredictable influences in their future null cones. Considering geodesics for a naked Reissner-Nordstrom singularity, it is found that the singularity is effectively clothed by its repulsive nature. Regarding electron as naked singularity, the size of the clothed singularity (electro...
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ژورنال
عنوان ژورنال: International Journal of Geometric Methods in Modern Physics
سال: 2012
ISSN: 0219-8878,1793-6977
DOI: 10.1142/s021988781220006x