3 papers
gr-qc2025
Qualitative analysis of a quasi-magnetic universe
Alan G. Cesar, Mario Novello, Eduardo Bittencourt +1
We investigate the cosmological dynamics induced by nonlinear electrodynamics in a homogeneous and isotropic universe, focusing on the role of primordial electromagnetic fields wit…
gr-qc2024
Qualitative analysis of viscous cosmology
A. G. Cesar, Mario Novello
We analyze the effect of higher order viscosity corrections in a spatially homogeneous and isotropic universe. The viscous effects are modeled by introducing a second-order term to…
gr-qc2023
Feasibility of singularity avoidance for a collapsing object due to a scalar field
Eduardo Bittencourt, Alan G. Cesar, Jonas P. Pereira
We study the problem of the gravitational collapse of an object as seen by an external observer. We assume that the resultant spacetime is a match of an external Vaidya spacetime w…