15 citations · 27 across the 6 of their papers we have counts for
11 papers · 1 filter
Instability of scalar perturbation in a phantomic cosmological scenario
J. C. Fabris, D. F. Jardim, S. V. B. Goncalves
Scalar perturbations can grow during a phantomic cosmological phase as the big rip is approached, in spite of the high accelerated expansion regime, if the equation of state is suc…
Different faces of the phantom
K. A. Bronnikov, J. C. Fabris, S. V. B. Gonçalves
The SNe type Ia data admit that the Universe today may be dominated by some exotic matter with negative pressure violating all energy conditions. Such exotic matter is called {\it…
Gravitational waves in the generalized Chaplygin gas model
J. C. Fabris, S. V. B. Goncalves, M. S. dos Santos
The consequences of taking the generalized Chaplygin gas as the dark energy constituent of the Universe on the gravitational waves are studied and the spectrum obtained from this m…
No-horizon theorem for spacetimes with spacelike G1 isometry groups
Sergio M. C. V. Goncalves
We consider four-dimensional spacetimes which obey the Einstein equations , and admit a global spacelike isometry gro…
No-horizon theorem for vacuum gravity with spacelike G1 isometry groups
Sergio M. C. V. Goncalves
We show that (3+1) vacuum spacetimes admitting a global, spacelike, one-parameter Lie group of isometries of translational type cannot contain apparent horizons. The only assumptio…
Comment on gr-qc/0309003: ``Comment on `Absence of trapped surfaces and singularities in cylindrical collapse' ''
Sergio M. C. V. Goncalves
Very recently, a ``Comment'' by Wang [gr-qc/0309003] on a paper by Gonçalves [Phys. Rev. D {\bf 65}, 084045 (2002)] appeared, claiming that Gonçalves' analysis of trapped surfaces…