40 citations · 297 across the 30 of their papers we have counts for
25 papers · 1 filter
Cylindrical Gravitational Waves in Einstein-Aether Theory
R. Chan, M. F. A. da Silva, V. H. Satheeshkumar
Along the lines of the Einstein-Rosen wave equation of General Relativity (GR), we derive a gravitational wave equation with cylindrical symmetry in the Einstein-aether (EA) theory…
Is Birkhoff's Theorem Valid in Einstein-Aether Theory?
R. Chan, M. F. A. da Silva, V. H. Satheeshkumar
We attempt to answer whether Birkhoff's theorem (BT) is valid in the Einstein-Aether (EA) theory. The BT states that any spherically symmetric solution of the vacuum field equation…
Radiant gravitational collapse with anisotropy in pressures and bulk viscosity
A. C. Mesquita, M. F. A. da Silva
We model a compact radiant star that undergoes gravitational collapse from a certain initial static configuration until it becomes a black hole. The star consists of a fluid with a…
Thermodynamics of Einstein-Aether Black Holes
R. Chan, M. F. A. da Silva, V. H. Satheeshkumar
We analyze several spherically symmetric exterior vacuum solutions allowed by the Einstein-Aether (EA) theory with a non static aether and study the thermodynamics of their Killing…
Static Cylindrical Symmetric Solutions in the Einstein-Aether Theory
R. Chan, M. F. A. da Silva
In this work we present all the possible solutions for a static cylindrical symmetric spacetime in the Einstein-Aether (EA) theory. As far as we know, this is the first work in the…
Compact Object with a Local Dark Energy Shell
L. S. M. Veneroni, A. Braz, M. F. A. da Silva
We investigate some models of compact objects in the general relativity theory with cosmological constant , based on two density profiles, one of them attributed to Stewart and…
Causal thermodynamics of a gravitational collapse model for an anisotropic fluid with dissipative flows
J. M. Z. Pretel, M. F. A. da Silva
This paper presents a hydrodynamic and thermodynamic treatment of a radiant star model that undergoes a dissipative gravitational collapse, from a certain initial configuration unt…
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,…
Translation in Cylindrically Symmetric Vacuum
M. -N. Celerier, R. Chan, M. F. A. da Silva +1
Starting from the stationary cylindrically symmetric solution, but with the coordinates and interchanged, and supposing that it could describe the vacuum spacetime of a tra…
Geodesics dynamics in the Linet-Tian spacetime with Lambda>0
Irene Brito, M. F. A. Da Silva, Filipe C. Mena +1
We analyse the geodesics' dynamics in cylindrically symmetric vacuum spacetimes with Lambda>0 and compare it to the Lambda=0 and Lambda<0 cases. When Lambda>0 there are two singula…
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…
Shear-free Dust Solution in General Covariant Hořava-Lifshitz Gravity
O. Goldoni, M. F. A. da Silva, R. Chan
In this paper, we have studied non stationary dust spherically symmetric spacetime, in general covariant theory ( extension) of the Hořava-Lifshitz gravity with the minimally…
Vaidya Solution in General Covariant Hořava-Lifshitz Gravity with the Minimum Coupling and without Projectability: Infrared Limit
O. Goldoni, M. F. A. da Silva, R. Chan +1
In this paper, we have studied nonstationary radiative spherically symmetric spacetime, in general covariant theory ( extension) of {the} Hořava-Lifshitz gravity with the min…
New look at black holes: Existence of universal horizons
Kai Lin, O. Goldoni, M. F. da Silva +1
In this paper, we study the existence of universal horizons in a given static spacetime, and find that the test khronon field can be solved explicitly when its velocity becomes inf…
Gravitational Collapse of an Imperfect Non Adiabatic Fluid
R. Chan, M. F. A. da Silva, C. F. C. Brandt
We study the evolution of an anisotropic shear-free fluid with heat flux and kinematic self-similarity of the second kind. We found a class of solution to the Einstein field equati…
Geodesics dynamics in the Linet-Tian spacetime with Lambda<0
Irene Brito, M. F. A. da Silva, Filipe C. Mena +1
We investigate the geodesics' kinematics and dynamics in the Linet-Tian metric with Lambda<0 and compare with the results for the Levi-Civita metric, when Lambda=0. This is used to…
Vaidya Solutions in General Covariant Hořava-Lifshitz Gravity without Projectability: Infrared Limit
O. Goldoni, M. F. A. da Silva, G. Pinheiro +1
In this paper, we have studied nonstationary radiative spherically symmetric spacetime, in general covariant theory ( extension) of Hořava-Lifshitz gravity without the projec…
Charged Gravastar in a Dark Energy Universe
C. F. C. Brandt, R. Chan, M. F. A. da Silva +1
Here we constructed a charged gravastar model formed by an interior de Sitter spacetime, a charged dynamical infinitely thin shell with an equation of state and an exterior de Sitt…
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…
Gravastars with an Interior Dark Energy Fluid Forming a Naked Singularity
C. F. C. Brandt, R. Chan, M. F. A. da Silva +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…
Gravastars and Black Holes of Anisotropic Dark Energy
R. Chan, M. F. A. da Silva, P. Rocha
Dynamical models of prototype gravastars made of anisotropic dark energy are constructed, in which an infinitely thin spherical shell of a perfect fluid with the equation of state…
Gravitational Collapse of Phantom Fluid in (2+1)-Dimensions
M. R. Martins, M. F. A. da Silva, Andrew D. Sheng
This investigation is devoted to the solutions of Einstein's field equations for a circularly symmetric anisotropic fluid, with kinematic self-similarity of the first kind, in $(2+…
Stable Gravastars of Anisotropic Dark Energy
R. Chan, M. F. A. da Silva, P. Rocha +1
Dynamical models of prototype gravastars made of phantom energy are constructed, in which an infinitely thin spherical shell of a perfect fluid with the equation of state $p = (1-γ…