70 citations · 194 across the 28 of their papers we have counts for
13 papers · 1 filter
Early dark energy induced by non-linear electrodynamics
H. B. Benaoum, Luz Ángela García, Leonardo Castañeda
In this work, we introduce a parametrization of early dark energy that mimics radiation at early times and governs the present acceleration of the Universe. We show that such param…
On perturbative constraints for vacuum f(R) gravity
Daniel Molano, Fabián Darío Villalba, Leonardo Castañeda +1
Perturbative techniques are important for modified theories of gravity since they allow to calculate deviations from General Relativity without recurring to exact solutions, which…
Equivalence between Scalar-Tensor theories and -gravity: From the action to Cosmological Perturbations
Joel Velasquez, Leonardo Castaneda
In this paper we calculate the field equations for Scalar-Tensor from a variational principle, in which we have taken into account the Gibbons-York-Hawking type boundary term. We d…
Generalized Papapetrou's equations of motion for an extended test body within static and isotropic metrics
William Almonacid, Leonardo Castañeda
Applying Dixon's general equations of motion for extended bodies, we compute the Papapetrou's equations for an extended test body on static and isotropic metrics. We incorporate th…
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…
Equivalence between formulations in Cosmological Perturbation Theory: The primordial magnetic fields as an example
Hector J. Hortua, Leonardo Castañeda
Nowdays, Cosmological Perturbation Theory is a standard and useful tool in theoretical cosmology. In this work, we compare the 1+3 covariant formalism in perturbation theory (Ellis…