What question did this study set out to answer?

This research aims to explore new dark energy models and their influence on the universe's geometry.

August 22, 2005Open Access

Probing the curvature and dark energy

Key Points

This research aims to explore new dark energy models and their influence on the universe's geometry.
Utilized type Ia supernova, Sloan Digital Sky Survey, and Wilkinson Microwave Anisotropy Probe data for analysis.
Developed one-parameter dark energy models to examine the universe's curvature and expansion behavior.
The universe is determined to be almost spatially flat, with dark energy contributing about 72% of its matter content.
The transition redshift for the universe's expansion from deceleration to acceleration is estimated at approximately z_T ~ 0.6.

Abstract

Two new one-parameter tracking behavior dark energy representations =₀/ (1+z) and =₀e^z/ (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 (0) -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 zₓ0. 6 by using our one-parameter dark energy models.

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