44 citations · 158 across the 19 of their papers we have counts for
21 papers
Lagrangian Extensions of Newtonian Gravity constrained by Solar System tests
Pedro H. Dalprá, Júlio C. Fabris, Hermano Velten +1
We explore an extension to Newtonian gravity through a generalised Lagrangian function with the introduction of a second dynamical scalar field. Building on previous research into…
A note on Gravitational radiation in generalized Brans-Dicke theory: compact binary systems
Diego S. Jesus, Hermano Velten, Júnior D. Toniato
This note revisits and corrects a previous analysis on gravitational radiation in compact binary systems within the framework of Brans-Dicke-f(R) theories-models featuring both mas…
In-depth analysis of violations of the (strong) equivalence principle in scalarized Einstein-Gauss-Bonnet theories
Martín G. Richarte, Júnior D. Toniato
We conducted a theoretical analysis of the violation of the equivalence principle within a broad class of scalar-Einstein-Gauss-Bonnet theories that exhibit spontaneous scalarizati…
Exploring Scalarized Einstein-Gauss-Bonnet Theories Through the Lens of Parametrized Post-Newtonian Formalism
Martín G. Richarte, Júnior D. Toniato
We explore scalarized Einstein-Gauss-Bonnet theories within the context of the Parameterized Post-Newtonian formalism, which serves as a robust framework for examining modification…
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…
A Post-Newtonian Analysis of Regularized 4D-EGB Theory: Complete Set of PPN Parameters and Observational Constraints
Júnior D. Toniato, Martín G. Richarte
We performed a post-Newtonian analysis of the regularized four-dimensional Einstein-Gauss-Bonnet gravitational theory (4D-EGB). The resulting metric differs from the classical para…
An overview of field theories of gravity
Mario Novello, Júnior D. Toniato
In the general relativity theory the basic ingredient to describe gravity is the geometry, which interacts with all forms of matter and energy, and as such, the metric could be int…
Celestial mechanics in Newtonian-like gravity with variable
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). This work demonstrates that the modified gravi…
A detailed first-order post-Newtonian analysis of massive Brans-Dicke theories: numerical constraints and the parameter meaning
Matheus F. S. Alves, Júnior D. Toniato, Davi C. Rodrigues
Massive Brans-Dicke (BD) theory is among the simplest general relativity extensions. It is commonly found as the weak-field limit of other gravitational theories. Here we do a deta…
Palatini gravity tests in the weak field limit: Solar System, seismology and galaxies
Alejandro Hernandez-Arboleda, Davi C. Rodrigues, Júnior D. Toniato +1
Palatini gravity is probably the simplest extension of general relativity (GR) and the simplest realization of a metric-affine theory. It has the same number of degrees of f…
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…
Post-Newtonian -like parameters and the gravitational slip in scalar-tensor and theories
Júnior D. Toniato, Davi C. Rodrigues
We review the fundamentals and highlight the differences between some commonly used definitions for the PPN gamma parameter () and the gravitational slip (). Here we stress t…
Newtonian-like gravity with variable
Júlio C. Fabris, Tales Gomes, Júnior D. Toniato +1
We propose a Lagrangian formulation for a varying Newtonian-like theory inspired by the Brans-Dicke gravity. Rather than imposing an {\it ad hoc} dependence for the gravitation…
Vector perturbations in bouncing cosmology
Nelson Pinto-Neto, Júlio C. Fabris, Júnior D. Toniato +2
An old question surrounding bouncing models concerns their stability under vector perturbations. Considering perfect fluids or scalar fields, vector perturbations evolve kinematica…
Palatini gravity in the solar system: post-Newtonian equations of motion and complete PPN parameters
Júnior D. Toniato, Davi C. Rodrigues, Aneta Wojnar
We perform a post-Newtonian (PN) solar system analysis for Palatini theories considering finite volume non-spherical planets and with emphasis to functions that are a…
The description of gravitational waves in geometric scalar gravity
Júnior Diniz Toniato
It is investigated the gravitational waves phenomena in the geometric scalar theory of gravity (GSG), a class of theories such that gravity is described by a single scalar field. T…
Will-Nordtvedt PPN formalism applied to renormalization group extensions of general relativity
Júnior D. Toniato, Davi C. Rodrigues, Álefe O. F. de Almeida +1
Here we apply the full Will-Nordtvedt version of the Parameterized Post-Newtonian (PPN) formalism to a class of General Relativity extensions that are based on nontrivial renormali…
Gravitational waves in geometric scalar gravity
J. D. Toniato, M. Novello
We investigate the gravitational waves phenomena in the geometric scalar theory of gravity (GSG) that belongs to a class of theories such that gravity is described by a single scal…
More about scalar gravity
E. Bittencourt, U. Moschella, M. Novello +1
We discuss a class of models for gravity based on a scalar field. The models include and generalize the old approach by Nordström which predated and in some way inspired General Re…
Cosmology in GSG
E. Bittencourt, U. Moschella, M. Novello +1
We describe what cosmology looks like in the context of the geometric theory of gravity (GSG) based on a single scalar field. There are two distinct classes of cosmological solutio…
Geometric scalar theory of gravity
M. Novello, E. Bittencourt, U. Moschella +3
We present a geometric scalar theory of gravity. Our proposal will be described using the "background field method" introduced by Gupta, Feynman and others as a field theory formul…