Probing the dynamical behavior of dark energy
Abstract
We investigate dynamical behavior of the equation of state of dark energy by employing the linear-spline method in the region of low redshifts from observational data (SnIa, BAO, CMB and 12 data). The redshift is binned and is approximated by a linear expansion of redshift in each bin. We leave the divided points of redshift bins as free parameters of the model, the best-fitted values of divided points will represent the turning positions of where changes its evolving direction significantly (if there exist such turnings in our considered region). These turning points are natural divided points of redshift bins, and between two nearby divided points can be well approximated by a linear expansion of redshift. We find two turning points of in and one turning point in , and could be oscillating around . Moreover, we find that there is a deviation of from -1 around in both correlated and uncorrelated estimates.
Keywords
Cite
@article{arxiv.1001.2207,
title = {Probing the dynamical behavior of dark energy},
author = {Rong-Gen Cai and Qiping Su and Hong-Bo Zhang},
journal= {arXiv preprint arXiv:1001.2207},
year = {2015}
}
Comments
Accepted by JCAP; 16 pages, 3 figures