Listar Articulos, Pre-prints (Facultad de Ciencias) por autor "Percoco, Umberto"

Mostrando ítems 1-6 de 6

    • Comment on Ricci Collineations of static spherically symmetric spacetimes 

      Núñez, Luis; Percoco, Umberto; Contreras, Gerardo; Bertolotti, Ricardo; Carot, Jaume (SABER ULA, 2006-01-26)
      Comment on Ricci Collineations of static spherically symmetric spacetimes (Núñez, Luis; Contreras, Gerardo; Percoco, Umberto; Bertolotti, Ricardo; Carot, J.) Abstract We present a counter example to a theorem given ...

    • Nonlocal equation of state in general relativistic radiating spheres 

      Núñez, Luis; Percoco, Umberto; Hernández G., Héctor (SABER ULA, 2006-01-26)
      Nonlocal equation of state in general relativistic radiating spheres (Núñez, Luis; Hernández, Hector; Percoco, Umberto) Abstract We show that under particular circumstances a general relativistic spherically symmetric ...

    • On the eccentricity behaviour of radiating slowly rotating bodies in general relativity 

      Núñez, Luis; Herrera Cometta, Luis; Percoco, Umberto; Hernández G., Héctor (SABER ULA, 2006-01-26)
      On the eccentricity behaviour of radiating slowly rotating bodies (Núñez, Luis; Hernández, Hector; Herrera, Luis; Percoco, Umberto) Abstract We study different models of radiating slowly rotating bodies up to the ...

    • On the general structure of Ricci collineations for type B warped spacetimes. 

      Flores, J. L.; Percoco, Umberto; Parra, Yoan (SABER ULA, 2005-08-18)
      On the general structure of Ricci collineations for type B warped spacetimes (Flores, J. L.; Parra, Yoan; Percoco, Umberto.) Abstract A complete study of the structure of Ricci collineations for type B warped spacetimes ...

    • Ricci collineations for non-degenerate, diagonal and spherically symmetric ricci tensors 

      Núñez, Luis; Percoco, Umberto; Contreras, Gerardo (SABER ULA, 2006-01-26)
      Ricci collineations for non-degenerate, diagonal and spherically symmetric ricci tensors (Núñez, Luis; Percoco, Umberto; Contreras, Gerardo) Abstract The expression of the vector field generator of a Ricci Collineation ...

    • Ricci collineations for type B warped space-times 

      Núñez, Luis; Percoco, Umberto; Carot, Jaume (SABER ULA, 2006-01-26)
      Ricci collineations for type B warped space-times (Núñez, Luis; Percoco, Umberto; Carot, J.) Abstract We present the general structure of proper Ricci Collineations (RC) for type B warped space-times. Within this ...