Reconstruction of the cosmic equation of state for high redshift

• Published in: The European physical journal. C, Particles and fields Particles and fields, 2019-12, Vol.79 (12), p.1-8, Article 1010
• Main Authors: Velasquez-Toribio, A. M., Machado, M. M., Fabris, Julio C.
• Format: Article
• Language: English
• Subjects: Analysis; Astronomy; Astrophysics and Cosmology; Elementary Particles; Equations of state; Gamma rays; Hadrons; Heavy Ions; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Radiation, Background; Red shift; Regular Article - Theoretical Physics; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-019-7508-7

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 ( SL ) effect; for the fiducial model, we use the Λ C D M 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 ( H 0 and Ω m 0 ). In the near future, following this methodology with a higher number of high quality data will help obtain strong restrictions for the EoS.