50 citations · 288 across the 13 of their papers we have counts for
13 papers
Bayesian correction of cosmic chronometers data with systematic errors
Nícolas Romeiro Kvint, José Fernando de Jesus, Saulo Henrique Pereira
We show that the 32 data from cosmic chronometers have overestimated uncertainties and make use of a Bayesian method to correct and reduce it. We then use the corrected data…
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…
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…
Mass dimension one fermions: Constructing darkness
Dharam Vir Ahluwalia, Julio M. Hoff da Silva, Cheng-Yang Lee +3
Let be the Wigner time reversal operator for spin half and let be a Weyl spinor. Then, for a left-transforming , the construct yields a right-transforming s…
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…
A search for the variation of speed of light using galaxy cluster gas mass fraction measurements
I. E. C. R. Mendonça, Kamal Bora, R. F. L. Holanda +2
In this paper, we implement a new method to test the invariance of the speed of light () as a function of redshift, by combining the measurements of galaxy cluster gas mass frac…
Galaxy cluster Sunyaev-Zel'dovich effect scaling-relation and type Ia supernova observations as a test for the cosmic distance duality relation
R. F. L. Holanda, L. R. Colaço, S. H. Pereira +1
In this paper, we propose a new test to the cosmic distance duality relation (CDDR), , where and are the luminosity and angular diameter distances, resp…
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…
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…
CCDM model from quantum particle creation: constraints on dark matter mass
J. F. Jesus, S. H. Pereira
In this work the results from the quantum process of matter creation have been used in order to constrain the mass of the dark matter particles in an accelerated Cold Dark Matter m…
Exact solutions to Elko spinors in spatially flat Friedmann-Robertson-Walker spacetimes
J. M. Hoff da Silva, S. H. Pereira
In this paper we present exact solutions to the so-called Elko spinors for three models of expanding universe, namely the de Sitter, linear and the radiation type evolution. The st…