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7 papers · 1 filter
A canonical transformation and the tunneling probability for the birth of an asymptotically DeSitter universe with dust
E. V. Corrêa Silva, G. A. Monerat, G. Oliveira-Neto +2
In the present work, we study the quantum cosmology description of closed Friedmann-Robertson-Walker models in the presence of a positive cosmological constant and a generic perfec…
Stable and "bounded excursion" gravastars, and black holes in Einstein's theory of gravity
P. Rocha, R. Chan, M. F. A. da Silva +1
Dynamical models of prototype gravastars are constructed and studied. The models are the Visser-Wiltshire three-layer gravastars, in which an infinitely thin spherical shell of a p…
Shearing Expansion-free Spherical Anisotropic Fluid Evolution
L. Herrera, N. O. Santos, A. Wang
Spherically symmetric expansionfree distributions are systematically studied. The whole set of field equations and junction conditions are presented for a general distribution of d…
The Efficiency of Gravitational Bremsstrahlung Production in the Collision of Two Schwarzschild Black Holes
R. F. Aranha, H. P. de Oliveira, I. Damião Soares +1
We examine the efficiency of gravitational bremsstrahlung production in the process of head-on collision of two boosted Schwarzschild black holes. We constructed initial data for t…
Numerical evolution of radiative Robinson-Trautman spacetimes
H. P. de Oliveira, E. L. Rodrigues
The evolution of spheroids of matter emitting gravitational waves and null radiation field is studied in the realm of radiative Robinson-Trautman spacetimes. The null radiation fie…
Reply to "Comment on 'Quantization of FRW spacetimes in the presence of a cosmological constant and radiation'"
N. A. Lemos, G. A. Monerat, E. V. Corrêa Silva +2
The Comment by Amore {\it et al.} [gr-qc/0611029] contains a valid criticism of the numerical precision of the results reported in a recent paper of ours [Phys. Rev. D {\bf 73}, 04…