78 citations · 178 across the 10 of their papers we have counts for
10 papers
Constraints on Cosmographic Functions of Cosmic Chronometers Data Using Gaussian Processes
A. M. Velasquez-Toribio, J. C. Fabris
We study observational constraints on the cosmographic functions up to the fourth derivative of the scale factor with respect to cosmic time, i.e., the so-called snap function, usi…
The growth factor parametrization versus numerical solutions in flat and non-flat dark energy models
A. M. Velásquez-Toribio, Júlio C. Fabris
In the present investigation we use observational data of to determine observational constraints in the plane using two different methods: the growth…
Constraints from observational data for a running cosmological constant and warm dark matter with curvature
Jhonny A. Agudelo Ruiz, Júlio C. Fabris, Alan M. Velasquez-Toribio +1
It is known than the inclusion of spatial curvature can modify the evolution of matter perturbations and affect the Large Scale Structure (LSS) formation. We quantify the effects o…
Reconstruction of the Cosmic Equation of State for High Redshift
A. M. Velasquez-Toribio, M. M. Machado, Julio C. Fabris
We investigate the possibilities of reconstructing the cosmic equation of state (EoS) for high redshift. In order to obtain general results, we use two model-independent approaches…
Interacting photon-baryon fluid, warm dark matter and the first acoustic peak
Julio. C. Fabris, Alan M. Velasquez-Toribio, Winfried Zimdahl +1
The Reduced Relativistic Gas (RRG) model was introduced by A. Sakharov in 1965 for deriving the cosmic microwave background (CMB) spectrum. It was recently reinvented by some of us…
Observational constraints on Rastall's cosmology
C. E. M. Batista, J. C. Fabris, O. F. Piattella +1
Rastall's theory is a modification of General Relativity, based on the non-conservation of the stress-energy tensor. The latter is encoded in a parameter such that resto…
Quantum corrections to gravity and their implications for cosmology and astrophysics
Julio C. Fabris, Paulo L. C. de Oliveira, Davi C. Rodrigues +2
The quantum contributions to the gravitational action are relatively easy to calculate in the higher derivative sector of the theory. However, the applications to the post-inflatio…
Testing dark matter warmness and quantity via the reduced relativistic gas model
Julio C. Fabris, Ilya L. Shapiro, A. M. Velasquez-Toribio
We use the framework of a recently proposed model of reduced relativistic gas (RRG) to obtain the bounds for 's of Dark Matter and Dark Energy (in the present case, a cosmologic…
Fitting cosmological data to the function from GR Theory: Modified Chaplygin Gas
Alan M. Velásquez-Toribio, Maria Luíza Bedran
In the Friedmann cosmology the deceleration of the expansion plays a fundamental role. We derive the deceleration as a function of redshift in two scenarios: CDM mode…
Cosmological Perturbations and the Running Cosmological Constant Model
A. M. Velasquez-Toribio
We study the matter density fluctuations in the running cosmological constant (RCC) model using linear perturbations in the longitudinal gauge. Using this observable we calculate t…