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Garay Elizondo, Luis Javier ; González Díaz, Pedro F. ; Mena Marugán, Guillermo A. ; Raya, José M. | Amer Physical Soc | 1997-06-15The quantization of circular strings in an anti-de Sitter background spacetime is performed, obtaining a discrete spectrum for the string mass. A comparison with a four-dimensional homogeneous and isotropic spacetime coupled to a conformal scala[...]texto impreso
Misner space is generalized to have the nonorientable topology of a Klein bottle, and it is shown that, in a classical spacetime with multiply connected space slices having such a topology, closed timelike curves are formed. Different regions on[...]texto impreso
Bouhmadi Lopez, M. ; Garay Elizondo, Luis Javier ; González Díaz, Pedro F. | Amer Physical Soc | 2002-09-15We study the quantum vacuum fluctuations around closed Friedmann-Robertson-Walker (FRW) radiation-filled universes with a nonvanishing cosmological constant. These vacuum fluctuations are represented by a conformally coupled massive scalar field[...]
