320 citations · 3k across the 92 of their papers we have counts for
93 papers
Black hole lensing in Kerr-de Sitter spacetimes
Eunice Omwoyo, Humberto Belich, Júlio C. Fabris +1
We have derived analytical solutions using Jacobi elliptic functions for bound and nearly bound photon orbits in Kerr-de Sitter (KdS) and Kerr-de Sitter Revisited (RKdS) spacetimes…
Remarks on the black hole shadows in Kerr-de Sitter space times
Eunice Omwoyo, Humberto Belich, Júlio C. Fabris +1
This work is geared towards analysis of shadows cast by Kerr-de Sitter (KdS) and Kerr-de Sitter Revisited (RKdS) black holes. Considering observers in the vicinity of the static ra…
Scattering and absorption of a scalar field impinging on a charged black hole in the Einstein-Maxwell-dilaton theory
Martín G. Richarte, Ébano L. Martins, Júlio C. Fabris
This study revisits the absorption and scattering process by which a massless scalar field impinges on a charged dilatonic black hole. First, we review the classical analysis to ob…
Stellar structure in a Newtonian theory with variable
Júlio C. Fabris, Túlio Ottoni, Júnior D. Toniato +1
A Newtonian-like theory inspired by the Brans-Dicke gravitational Lagrangian has been recently proposed. For static configurations the gravitational coupling acquires an intrinsic…
The simplest wormhole in Rastall and k-essence theories
Kirill A. Bronnikov, Vinícius A. G. Barcellos, Laura P. de Carvalh +1
The geometry of the Ellis-Bronnikov wormhole is implemented in the Rastall and k-essence theories of gravity with a self-interacting scalar field. The form of the scalar field pote…
The growth factor parametrization versus numerical solutions in flat and non-flat dark energy models
A. M. Velásquez-Toribio, Júlio C. Fabris
In the present investigation we use observational data of to determine observational constraints in the plane using two different methods: the growth…