301 citations · 2.1k across the 77 of their papers we have counts for
4 papers · 1 filter
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…
Constraining the anomalous coupling of gravitational waves with double pulsar
Diego Santos de Jesus, Hermano Velten, Federico Piazza
We revisit the decay of the orbital period in binary systems that occurs due to the emission of gravitational waves in the context of modified gravity models where the coupling $G_…
Brans-Dicke unimodular gravity
Alexandre M. R. Almeida, Júlio C. Fabris, Mahamadou Hamani Daouda +3
We propose a unimodular version of the Brans-Dicke theory designed with a constrained Lagrangian formulation. The resulting field equations are traceless. The vacuum solutions in t…
Skewness as a test of dark energy perturbations
Raquel Emy Fazolo, Luca Amendola, Hermano Velten
We investigate the role played by dark energy perturbations in the skewness of large-scale matter distribution. We consider a two-fluid universe composed by matter and dark e…