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Local anisotropy in self-gravitating systems

- L. Herrera, N. O. Santos
- Physics
- 1 July 1997

Abstract We review and discuss possible causes for the appearance of local anisotropy (principal stresses unequal) in self-gravitating systems and present its main consequences. We consider both… Expand

514 5

Dynamical instability for radiating anisotropic collapse

- R. Chan, L. Herrera, N. O. Santos
- Physics
- 1 December 1993

We study the role played by local anisotropy and radiation (in the free-streaming regime) in the onset of dynamical instabilities. In the case of anisotropy we find that, for Newtonian and… Expand

229 5

Dynamical instability for non-adiabatic spherical collapse

- L. Herrera, G. Denmat, N. O. Santos
- Physics
- 1 March 1989

Etude de l'instabilite dynamique d'une distribution de fluide a symetrie spherique lors de l'effondrement non adiabatique et subissant une dissipation sous la forme d'un ecoulement radial de chaleur.… Expand

110 5

Dynamics of dissipative gravitational collapse

- L. Herrera, N. O. Santos
- Physics
- 4 October 2004

The Misner and Sharp approach to the study of gravitational collapse is extended to the dissipative case in, both, the streaming out and the diffusion approximations. The role of different terms in… Expand

118 3- PDF

Shear-free radiating collapse and conformal flatness

- L.Herrera, G. Denmat, N. O. Santos, A. Wang
- Physics
- 7 January 2004

Here we study some general properties of spherical shear-free collapse. Its general solution when imposing conformal atness is re-obtained (Refs. 1 and 2) and matched to the outgoing Vaidya… Expand

67 3- PDF

Dynamical instability for shearing viscous collapse

- R. Chan, L. Herrera, N. O. Santos
- Physics
- 1 April 1994

We study the role played by the shear and the shearing viscosity in the onset of dynamical instabilities. For both the Newtonian and the relativistic regimes, the shearing viscosity decreases the… Expand

99 2

Shearing expansion-free spherical anisotropic fluid evolution

- L. Herrera, N. O. Santos, A. Wang
- Physics
- 7 October 2008

Spherically symmetric expansion-free distributions are systematically studied. The entire set of field equations and junction conditions are presented for a general distribution of dissipative… Expand

105 2- PDF

EXPANSION-FREE EVOLVING SPHERES M UST HAVE INHOM OGENEOUS ENERGY DENSITY DISTRIBUTIONS

- L. Herrera, G. Denmat, N. O. Santos
- Physics
- 27 March 2009

In a recent paper a systematic study on shearing expansion-free spherically symmetric distributions was presented. As a particular case of such systems, the Skripkin model was mentioned, which… Expand

52 2- PDF

Spatially homogeneous cosmological models

- A. Banerjee, N. O. Santos
- Physics
- 1 March 1984

We study nonviscous and viscous fluids in Bianchi types II, VIII, and IX space-times under the restriction that the ratio of shear to expansion be constant.

40 2

The parameters of the Lewis metric for the Weyl class

- M. A. D. Silva, L. Herrera, F. M. Paiva, N. O. Santos
- Physics
- 1 August 1995

We provide physical interpretation for the four parameters of the stationary Lewis metric restricted to the Weyl class. Matching this spacetime to a completely anisotropic, rigidly rotating, fluid… Expand

26 2- PDF

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