103 citations · 221 across the 13 of their papers we have counts for
12 papers
Wormhole Reconstruction in Non-Conservative Unimodular Gravity: Ricci Scalar as an Independently Prescribed Curvature Profile
Marcelo H. Alvarenga, Rodrigo Santos Bufalo, Júlio C. Fabris
The absence of an algebraic relation between the Ricci scalar and the trace of the energy-momentum tensor in Non-Conservative Unimodular Gravity () opens new possibil…
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…
Generalized Unimodular Gravity and Cosmological Perturbations
Júlio C. Fabris, Alexander Yu. Kamenshchik
The generalized unimodular theory is revisited and its consequence for cosmology is discussed. The usual matter components of the universe are obtained in a pure geometric way. Thi…
Anisotropic Bianchi-I cosmological model in non-conservative unimodular gravity
Marcelo H. Alvarenga, Júlio C. Fabris
In this article, we propose an anisotropic Bianchi-I type cosmological model in non-conservative Unimodular Gravity (). We show that simply using the Bianchi-I type m…
Dilaton gravity, charged dust, and (quasi-) black holes
K. A. Bronnikov, J. C. Fabris, R. Silveira +1
We consider Einstein-Maxwell-dilaton gravity with charged dust and interaction of the form , where is an arbitrary function of the dilaton field that…
Dilaton gravity, (quasi-) black holes, and scalar charge
K. A. Bronnikov, J. C. Fabris, R. Silveira +1
We consider static electrically charged dust configurations in the framework of Einstein-Maxwell-dilaton gravity with the interaction term P(χ) F_{mn} F^{mn} in the Lagrangian, whe…
Cosmology with Ricci dark energy
Sergio del Campo, Júlio. C. Fabris, Ramón Herrera +1
We assume the cosmological dark sector to consist of pressureless matter and holographic dark energy with a cutoff length proportional to the Ricci scale. The requirement of separa…
On holographic dark-energy models
Sergio del Campo, Júlio. C. Fabris, Ramón Herrera +1
Different holographic dark-energy models are studied from a unifying point of view. We compare models for which the Hubble scale, the future event horizon or a quantity proportiona…
Power spectrum in the Chaplygin gas model: tachyonic, fluid and scalar field representations
C. E. M. Batista, J. C. Fabris, M. Morita
The Chaplygin gas model, characterized by an equation of state of the type emerges naturally from the Nambu-Goto action of string theory. This fluid representatio…
Big rip avoidance via black holes production
Julio C. Fabris, Diego Pavon
We consider a cosmological scenario in which the expansion of the Universe is dominated by phantom dark energy and black holes which condense out of the latter component. The mass…
Spiral Galaxies Rotation Curves with a Logarithmic Corrected Newtonian Gravitational Potential
J. C. Fabris, J. P. Campos
We analyze the rotation curves of 10 spiral galaxies with a newtonian potential corrected with an extra logarithmic term, using a disc modelization for the spiral galaxies. There i…
A remark on Brans-Dicke dust cosmological solutions with negative
A. B. Batista, J. C. Fabris, R. de Sá Ribeiro
Analysing the Brans-Dicke solutions for the dust phase, we show that, for negative values of , they contain scenarios that display an initial subluminal expansion followed by an…