15 citations · 28 across the 4 of their papers we have counts for
5 papers
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…
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…
Qualitative analysis of a scalar-tensor theory with exponential potential
A. B. Batista, J. C. Fabris, S. V. B. Goncalves +1
A qualitative analysis of a scalar-tensor cosmological model, with an exponential potential for the scalar field, is performed. The phase diagram for the flat case is constructed.…
Density Perturbations in the Brans-Dicke Theory
J. P. Baptista, J. C. Fabris, S. V. B. Goncalves
We analyse the fate of density perturbation in the Brans-Dicke Theory, giving a general classification of the solutions of the perturbed equations when the scale factor of the back…