arXiv subjects

L. Castañeda

Publications and source records attributed to L. Castañeda.

2 recordsLinked to original sources

arXiv2014

Cosmological simulations: a tool for understanding the formation of large scale structure and connection with the Newtonian cosmology

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 cosmology with Poisson gauge and we study the solution of the Einstein's field equations for this gauge. The simulations are essential for taking account the results of the cosmological model, allowing to compare the results with observational data. The N-bodies simulations have been used from systems of few bodies to the evolution and formation of nonlinear large scale structure as filaments and galactic halos.

astro-ph.GA↗

arXiv2012

K-essence scalar field as dynamical dark energy

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 the redshift $z$ with the tracker condition during radiation domination, but also demanding an accelerated expansion of the universe at late times emulating cosmological constant. We found all the dynamical variables of the EDE system. We use the luminosity distances of the SNIA to get the best estimations for the free parameters of the model and also, we constrain the model using primordial abundances of light nuclei in BBN theory. We summarize the necessary conditions to achieve BBN predictions and the accelerated expansion of the universe at late times.

astro-ph.CO↗