Constraints of the equation of state of dark energy from current and future observational data by piecewise parametrizations

2012/04/10 by Qiping Su, Qi-Ping Su, Xi He +4
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #astro-ph.CO #gr-qc

paper · pdf · doi:10.48550/arxiv.1204.2146

16 pages, 2 figures, 5 tables

arxiv created 2012/04/10 · openalex publication_date 2012/04/10 · arxiv updated 2012/04/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The model-independent piecewise parametrizations (0-spline, linear-spline and cubic-spline) are used to estimate constraints of equation of state of dark energy (w_de) from current observational data (including SNIa, BAO and Hubble parameter) and the simulated future data. A combination of fitting results of w_de from these three spline methods reveal essential properties of real equation of state w_de. It is shown that w_de beyond redshift z∼0.5 is poorly constrained from current data, and the mock future ∼2300 supernovae data give poor constraints of w_de beyond z∼1. The fitting results also indicate that there might exist a rapid transition of w_de around z∼0.5. The difference between three spline methods in reconstructing and constraining w_de has also been discussed.

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