70 citations · 152 across the 16 of their papers we have counts for
18 papers
A novel early Dark Energy model
Luz Ángela García, Leonardo Castañeda, Juan Manuel Tejeiro
We present a theoretical study of an early dark energy (EDE) model. The equation of state evolves during the thermal history in a framework of a Friedmann-Lemaitre-Robertson…
Numerical solution of Mathisson-Papapetrou-Dixon equations for spinning test particles in a Kerr metric
Nelson Velandia-Heredia, Juan Manuel Tejeiro-Sarmiento
In this work we calculate some estimations of the gravitomagnetic clock effect, taking into consideration not only the rotating gravitational field of the central mass, but also th…
Equations for spinning test particles in equatorial orbits when they are orbiting in a weak rotating field
Nelson Velandia, Juan Manuel Tejeiro
This paper formulates, via the Mathisson - Papapetrou - Dixon equations, the system of equations for a test particle with spin when it is orbiting a weak Kerr metric. We shall rest…
Study of null geodesic in an axially symmetric space
Jonathan Pineda, Leonardo Castañeda, Juan Manuel Tejeiro
Since the development of Relativity theory, a variety of solutions have been found around Einstein field equations, depending on the time-space. For instance, we can find the axial…
Cosmological simulations: a tool for understanding the formation of large scale structure and connection with the Newtonian cosmology
J. E. García Farieta, L. Castañeda, J. M. Tejeiro
In this work we study the cosmological simulations as a tool to understand the formation of large-scale structure of the universe, for this, we show the equivalence of Newtonian co…
Erratum to: Geodesic Deviation Equation in f(R) Gravity
Alejandro Guarnizo, Leonardo Castaneda, Juan M. Tejeiro
In the context of metric gravity, the Geodesic Deviation Equation (GDE) was first studied in arXiv:1010.5279v3, giving a general expression and studying a particular case, t…
Gravitational Lensing by Spherical Lenses
Roger Hurtado, Leonardo Castaneda, Juan M. Tejeiro
In this work we introduced a new proposal to study the gravitational lensing theory by spherical lenses, starting from its surface mass density written in terms of a decreas…
K-essence scalar field as dynamical dark energy
L. García, J. Tejeiro, L. Castañeda
We study an early dark energy (EDE) model as a K-essence scalar field in the framework of FLRW universe using an effective parametrization of the state equation as a function of th…
Entanglement Entropy of Black Shells
J. Robel Arenas, J. Manuel Tejeiro
We present a coherent account of how the entanglement interpretation, thermofield dynamical description and the brick wall formulations (with the ground state correctly identified)…
Evolution of magnetic fields through cosmological perturbation theory
Hector J. Hortua, Leonardo Castaneda, Juan M. Tejeiro
The origin of galactic and extra-galactic magnetic fields is an unsolved problem in modern cosmology. A possible scenario comes from the idea of these fields emerged from a small f…
Geodesic Deviation Equation in f(R) Gravity
Alejandro Guarnizo, Leonardo Castaneda, Juan M. Tejeiro
In this paper we study the Geodesic Deviation Equation (GDE) in metric f(R) gravity. We start giving a brief introduction of the GDE in General Relativity in the case of the standa…
Three Dimensional Charged Black Hole Inspired by Noncommutative Geometry
Alexis Larranaga, Juan Manuel Tejeiro
We find a new charged black hole in three-dimensional anti-de Sitter space using an anisotropic perfect fluid inspired by the noncommutative black hole as the source of matter and…
Noncommutative Geometry Inspired Rotating Black Hole in Three Dimensions
Juan Manuel Tejeiro, Alexis Larranaga
We find a new rotating black hole in three-dimensional anti-de Sitter space using an anisotropic perfect fluid inspired by the noncommutative black hole. We deduce the thermodynami…
Shear Dynamics in Bianchi I Cosmology
Diego Caceres, Leonardo Castaneda, Juan M. Tejeiro
We present the exact equation for evolution of Bianchi I cosmological model, considering a non-tilted perfect fluid in a matter dominated universe. We use the definition of shear t…
Boundary Term in Metric f(R) Gravity: Field Equations in the Metric Formalism
Alejandro Guarnizo, Leonardo Castaneda, Juan M. Tejeiro
The main goal of this paper is to get in a straightforward form the field equations in metric f(R) gravity, using elementary variational principles and adding a boundary term in th…
Geodesic Deviation Equation in Bianchi Cosmologies
D. L. Caceres, L. Castaneda, J. M. Tejeiro
We present the Geodesic Deviation Equation (GDE) for the Friedmann-Robertson-Walker(FRW) universe and we compare it with the equation for Bianchi type I model. We justify consider…
Constraint on the Mass of Primordial Black Holes from the Value of the Cosmological Constant
Alexis Larranaga, J. M. Tejeiro
In a recent propposal, the cosmological constant has been considered as as a new thermodynamical variable and its change is related to the radiation produced by black holes. Using…
Gravitational Lensing by Asymptotically Flat Wormholes
J. M. Tejeiro, E. Larranaga
Natural wormholes and its astrophysical signatures have been sugested in various oportunities. By applying the strong field limit of gravitational lensing theory, we calculate the…