15 citations · 56 across the 9 of their papers we have counts for
7 papers
Reconstruction of the Cosmic Equation of State for High Redshift
A. M. Velasquez-Toribio, M. M. Machado, Julio C. Fabris
We investigate the possibilities of reconstructing the cosmic equation of state (EoS) for high redshift. In order to obtain general results, we use two model-independent approaches…
Stiff Matter Solution in Brans-Dicke Theory and The General Relativity Limit
G. Brando, J. C. Fabris, F. T. Falciano +1
Generally the Brans-Dicke theory reduces to General Relativity in the limit if the scalar field goes as . However, it is also known that there are…
Dilaton Quantum Cosmology with a Schrodinger-like equation
J. C. Fabris, F. T. Falciano, P. Vargas Moniz +2
A quantum cosmological model with radiation and a dilaton scalar field is analysed. The Wheeler-deWitt equation in the mini-superspace induces a Schrödinger equation, which can be…
The clustering of dark energy
F. G. Alvarenga, J. C. Fabris, S. V. B. Gonçalves +1
A cosmological model with pressurelless matter and a fluid of negative pressure is studied. At perturbative level, fluctuations of both fluids are considered. It is shown that at l…
An analysis of helium primordial nucleosynthesis with a variable cosmological coupling
F. G. Alvarenga, J. C. Fabris, S. V. B. Goncalves +1
The synthesis of helium in the early Universe depends on many input parameters, including the value of the gravitational coupling during the period when the nucleosynthesis takes p…
On the consistency of a repulsive gravity phase in the early Universe
A. B. Batista, J. C. Fabris, S. V. B. Goncalves
We exploit the possibility of existence of a repulsive gravity phase in the evolution of the Universe. A toy model with a free scalar field minimally coupled to gravity, but with t…
Gravitational waves in a stringlike fluid cosmology
J. C. Fabris, S. V. B. Goncalves
The coupling of a stringlike fluid with ordinary matter and gravity may lead to a closed Universe with the dynamic of an open one. This can provide an alternative solution for the…