5 papers
A Lagrangian formulation for Rastall gravity and a covariant formulation for unimodular gravity
Juilson A. P. Paiva, Julio C. Fabris, Vilson T. Zanchin
We propose a Lagrangian formulation for a non-conservative gravity model in which the divergence of the energy-momentum tensor in curved spacetime does not vanish. This is accompli…
A new framework for cosmological expansion in a reformulated Newtonian-Like gravity with variable G
Felipe S. Escórcio, Júlio C. Fabris, Júnior D. Toniato +1
A Newtonian-like theory inspired by the Brans-Dicke gravitational Lagrangian has been recently proposed in Ref. arXiv:2009.04434(v4). We propose here a new variant of this theory s…
Quasar Pairs as Large--Scale Structure tracers
MartÃn G. Richarte, Facundo Toscano, Diego G. Lambas +3
Quasars are effective tracers of the large-scale distribution of galaxies at high redshift thanks to their high luminosity and dedicated surveys. Previous studies have shown that q…
Revisiting Unimodular Quantum Cosmology
Júlio C. Fabris, Luiz Filipe Guimarães, Nelson Pinto-Neto +1
The quantization of unimodular gravity in minisuperspace leads to a time evolution of states generated by the Hamiltonian, as in usual quantum mechanics. We revisit the analysis ma…
Fluid and scalar field representations in the Brans-Dicke theory: cosmological scenarios
Tiago H. B. Alves, Júlio C. Fabris, Luiz Filipe Guimarães
The Brans-Dicke scalar-tensor cosmological models are studied in both Einstein and Jordan frames, using hydrodynamical and self-interacting scalar field representations of the ener…