99 citations · 284 across the 13 of their papers we have counts for
13 papers
Dynamical dark energy from Kretschmann scalar at low redshifts
A. B. Fernandes, S. H. Pereira, J. F. Jesus +1
In this work, we present a cosmological model in which the cosmological constant term is replaced by the Kretschmann scalar at the level of the action. In this way, it becomes poss…
Can decaying vacuum solve the H_0 Tension?
L. S. Brito, J. F. Jesus, A. A. Escobal +1
In the present work we analyze two different models of interaction between dark energy and dark matter, also known as vacuum decay models or CDM models. In both models, when…
Revisiting the two-body problem in Yukawa gravity and in a gravitational extension of the Buckingham potential
E. A. Gallegos, R. Perca Gonzales, J. F. Jesus
We revisit the Keplerian-like parametrization of the two-body problem in Yukawa gravity studied in the literature. Some inconsistencies, which spoil Bertrand's theorem, observed in…
High-redshift cosmography with a possible cosmic distance duality relation violation
José F. Jesus, Mikael J. S. Gomes, Rodrigo F. L. Holanda +1
In this study, we used geometric distances at high redshifts (both luminosity and angular) to perform a cosmographic analysis with the Padé method, which stabilizes the behaviour o…
Kinematic reconstruction of torsion as dark energy in Friedmann cosmology
A. M. Vicente, J. F. Jesus, S. H. Pereira
In this paper we study the effects of torsion of space-time in the expansion of the Universe as a candidate to dark energy. The analysis is done by reconstructing the torsion funct…
A Method for Obtaining Cosmological Models Consistency Relations and Gaussian Processes Testing
J. F. Jesus, A. A. Escobal, R. Valentim +1
In the present work, we apply consistency relation tests to several cosmological models, including the flat and non-flat CDM models, as well as the flat XCDM model. The analysis…
Gaussian Processes Reconstruction of the Dark Energy Potential
J. F. Jesus, R. Valentim, A. A. Escobal +2
Scalar Fields (SF) have emerged as natural candidates for dark energy as quintessential or phantom fields, as they are the main ingredient of inflation theories. Instead of assumin…
Cosmological parameter analyses using transversal BAO data
Rafael C. Nunes, Santosh K. Yadav, J. F. Jesus +1
We investigate observational constraints on cosmological parameters combining 15 measurements of the transversal BAO scale (obtained free of any fiducial cosmology) with Planck-CMB…
Acceleration in Friedmann cosmology with torsion
S. H. Pereira, R. de C. Lima, J. F. Jesus +1
A Friedmann like cosmological model in Einstein-Cartan framework is studied when the torsion function is assumed to be proportional to a single function coming just from the…
Model independent constraints on transition redshift
J. F. Jesus, R. F. L. Holanda, S. H. Pereira
This paper aims to put constraints on the transition redshift , which determines the onset of cosmic acceleration, in cosmological-model independent frameworks. In order to pe…
Bayesian correction of data uncertainties
J. F. Jesus, T. M. Gregório, F. Andrade-Oliveira +2
We compile 41 data from literature and use them to constrain OCDM and flat CDM parameters. We show that the available suffers from uncertainties overestimation…
cosmology induced by a slowly varying Elko field
S. H. Pereira, S. S. A. Pinho, J. M. Hoff da Silva +1
In this work the exact Friedmann-Robertson-Walker equations for an Elko spinor field coupled to gravity in an Einstein-Cartan framework are presented. The torsion functions couplin…
Can Dark Matter be a Scalar Field?
J. F. Jesus, S. H. Pereira, J. L. G. Malatrasi +1
In this paper we study a real scalar field as a possible candidate to explain the dark matter in the universe. In the context of a free scalar field with quadratic potential, we ha…