Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8141872 | Physics of the Dark Universe | 2016 | 26 Pages |
Abstract
Reconstructing the evolution history of the dark energy equation of state parameter w(z) directly from observational data is highly valuable in cosmology, since it contains substantial clues in understanding the nature of the accelerated expansion of the Universe. Many works have focused on reconstructing w(z) using Type Ia supernova data, however, only a few studies pay attention to Hubble parameter data. In the present work, we explore the merit of Hubble parameter data and make an attempt to reconstruct w(z) from them through the principle component analysis approach. We find that current Hubble parameter data perform well in reconstructing w(z); though, when compared to supernova data, the data are scant and their quality is worse. Both ÎCDM and evolving w(z) models can be constrained within 10% at redshifts zâ²1.5 and even 5% at redshifts 0.1â²zâ²1 by using simulated H(z) data of observational quality.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
Zhi-E Liu, Hao-Ran Yu, Tong-Jie Zhang, Yan-Ke Tang,