English

Reconstruction of the Cosmic Equation of State for High Redshift

Cosmology and Nongalactic Astrophysics 2019-05-28 v1

Abstract

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. The first reconstructs the EoS using comoving distance and the second makes use of the Hubble parameter data. To implement the first method, we use a recent set of Gamma-Ray Bursts (GRBs) measures. To implement the second method, we generate simulated data using the Sandage-Loeb (SLSL) effect; for the fiducial model, we use the ΛCDM\Lambda CDM model. In both cases, the statistical analysis is conducted through the Gaussian processes (non-parametric). In general, we demonstrate that this methodology for reconstructing the EoS using a non-parametric method plus a model-independent approach works appropriately due to the feasibility of calculation and the ease of introducing a priori information (H0H_ {0} and Ωm0\Omega_{m0}). In the near future, following this methodology with a higher number of high quality data will help obtain strong restrictions for the EoS.

Keywords

Cite

@article{arxiv.1905.10492,
  title  = {Reconstruction of the Cosmic Equation of State for High Redshift},
  author = {A. M. Velasquez-Toribio and M. M. Machado and Julio C. Fabris},
  journal= {arXiv preprint arXiv:1905.10492},
  year   = {2019}
}

Comments

9 pages, 5 figures