2005/02/28 by Yungui Gong, Yuan‐Zhong Zhang, Yuan-Zhong Zhang
Physics and Astronomy · #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Radio Astronomy Observations and Technology #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.72.043518
published as Phys.Rev. D72 (2005) 043518 · v2: two more figures are added, use revtex, main conclusion unchanged, Accepted for publication in Phys. Rev. D, v3: some typos corrected v4: correct caculation errors in model 4
openalex publication_date 2005/08/22 · arxiv created 2006/04/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Two new one-parameter tracking behavior dark energy representations \ensuremathω=\ensuremathω0/(1+z) and \ensuremathω=\ensuremathω0ez/(1+z)/(1+z) are used to probe the geometry of the Universe and the property of dark energy. The combined type Ia supernova, Sloan Digital Sky Survey, and Wilkinson Microwave Anisotropy Probe data indicate that the Universe is almost spatially flat and that dark energy contributes about 72% of the matter content of the present universe. The observational data also tell us that \ensuremathω(0)\ensuremath∼\ensuremath-1. It is argued that the current observational data can hardly distinguish different dark energy models to the zeroth order. The transition redshift when the expansion of the Universe changed from deceleration phase to acceleration phase is around zT\ensuremath∼0.6 by using our one-parameter dark energy models.