17 citations · 29 across the 7 of their papers we have counts for
7 papers
Quasinormal modes and the analytical continuation of non-self-adjoint operators
M. G. Richarte, J. C. Fabris, A. Saa
We briefly review the analytical continuation method for determining quasinormal modes (QNMs) and the associated frequencies in open systems. We explore two exactly solvable cases…
Some Remarks on Alternative (or Modified) Theories of Gravity
Júlio C. Fabris
A seminar given about 30 years ago by Ruben Aldrovandi motivates this text where some reflexions about constructing theories that modify General Relativity are made. Two particular…
Introduction to cosmology
J. C. Fabris
This text consists on a series of introductory lectures on cosmology for mathematicians and physicists who are not specialized on the subject.
Semi-Analytical Analysis of Helium Synthesis in Brane Cosmology
J. C. Fabris, J. A. O. Marinho
The problem of primordial nucleosynthesis of helium in brane cosmology is studied using a semi-analytical method, where the Fermi-Dirac statistic is ignored. This semi-analytical m…
Fitting the Supernova Type Ia Data with the Chaplygin Gas
J. C. Fabris, S. V. B. Goncalves, P. E. de Souza
The supernova type Ia observational data are fitted using a model with cold dark matter and the Chaplygin gas. The Chaplygin gas, which is characterized by a negative pressure vary…
Evolution of perturbations in a domain wall cosmology
J. C. Fabris, S. V. B. Goncalves
A fluid of domain walls has an effective equation of state . This equation of state is qualitativelly in agreement with the supernova type Ia observations. We exp…