58 citations · 244 across the 15 of their papers we have counts for
15 papers
Vacuum solutions in the Einstein-Aether Theory
M. Campista, R. Chan, M. F. A. da Silva +3
The Einstein-Aether (EA) theory belongs to a class of modified gravity theories characterized by the introduction of a time-like unit vector field, called aether. In this scenario,…
A Dynamical Solution in Horava-Lifshitz Gravity in the IR limit
O. Goldoni, M. F. A. da Silva, R. Chan +2
Non-stationary null dust in a spherically symmetric spacetime is studied in the context of a general-covariant Horava-Lifshitz theory. The non-minimal coupling to matter is conside…
Gravastars with Dark Energy Evolving to Naked Singularity
R. Chan, M. F. A. da Silva, P. Senna +1
We consider a gravastar model made of anisotropic dark energy with an infinitely thin spherical shell of a perfect fluid with the equation of state with an external de…
Radiating Gravastars
R. Chan, M. F. A. da Silva, J. F. Villas da Rocha +1
Considering a Vaidya exterior spacetime, we study dynamical models of prototype gravastars, made of an infinitely thin spherical shell of a perfect fluid with the equation of state…
Dynamical Evolution of an Unstable Gravastar with Zero Mass
R. Chan, M. F. A. da Silva, Jaime F. Villas da Rocha
Using the conventional gravastar model, that is, an object constituted by two components where one of them is a massive infinitely thin shell and the other one is a de Sitter inter…
Dressing a Naked Singularity: an Example
C. F. C. Brandt, R. Chan, M. F. A. da Silva +1
Considering the evolution of a perfect fluid with self-similarity of the second kind, we have found that an initial naked singularity can be trapped by an event horizon due to coll…
Star Models with Dark Energy
R. Chan, M. F. A. da Silva, J. F. Villas da Rocha
We have constructed star models consisting of four parts: (i) a homogeneous inner core with anisotropic pressure (ii) an infinitesimal thin shell separating the core and the envelo…
On Anisotropic Dark Energy
R. Chan, M. F. A. da Silva, J. F. Villas da Rocha
Since the discovery of the accelerated expansion of the universe, it was necessary to introduce a new component of matter distribution called dark energy. The standard cosmological…
Constraining a double component dark energy model using type Ia supernovae data
Fabrício Casarejos, J. C. Fabris, S. V. B. Gonçalves +1
A two-component fluid representing dark energy is studied. One of the components has a polytropic form, while the other has a barotropic form. Exact solutions are obtained and the…
Perturbed Self-Similar Massless Scalar Field in the Spacetimes with Circular Symmetry in 2+1 Gravity
R. Chan, M. F. A. da Silva, Jaime F. Villas da Rocha
We present in this work the study of the linear perturbations of the 2+1-dimensional circularly symmetric solution, obtained in a previous work, with kinematic self-similarity of t…
Gravitational Collapse of Massless Scalar Field with Negative Cosmological Constant in (2+1) Dimensions
R. Chan, M. F. A. da Silva, Jaime F. Villas da Rocha
The 2+1-dimensional geodesic circularly symmetric solutions of Einstein-massless-scalar field equations with negative cosmological constant are found and their local and global pro…
Gravitational collapse of spherically symmetric perfect fluid with kinematic self-similarity
C. F. C. Brandt, L. -M. Lin, J. F. Villas da Rocha +1
Analytic spherically symmetric solutions of the Einstein field equations coupled with a perfect fluid and with self-similarities of the zeroth, first and second kinds, found recent…
Collapsing Perfect Fluid in Higher Dimensional Spherical Spacetimes
J. F. Villas da Rocha, Anzhong Wang
The general metric for N-dimensional spherically symmetric and conformally flat spacetimes is given, and all the homogeneous and isotropic solutions for a perfect fluid with the eq…
Gravitational Collapse of Perfect Fluid
J. F. Villas da Rocha, Anzhong Wang, N. O. Santos
The spherical gravitational collapse of a compact packet consisting of perfect fluid is studied. The spacetime outside the fluid packet is described by the out-going Vaidya radiati…
Gravitational collapse of massless scalar field and radiation fluid
Anzhong Wang, J. F. Villas da Rocha, N. O. Santos
Several classes of conformally-flat and spherically symmetric exact solutions to the Einstein field equations coupled with either a massless scalar field or a radiation fluid are g…