English

Probing the dynamical behavior of dark energy

Cosmology and Nongalactic Astrophysics 2015-05-14 v2 General Relativity and Quantum Cosmology High Energy Physics - Theory

Abstract

We investigate dynamical behavior of the equation of state of dark energy wdew_{de} by employing the linear-spline method in the region of low redshifts from observational data (SnIa, BAO, CMB and 12 H(z)H(z) data). The redshift is binned and wdew_{de} 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 wdew_{de} where wdew_{de} 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 wdew_{de} between two nearby divided points can be well approximated by a linear expansion of redshift. We find two turning points of wdew_{de} in z(0,1.8)z\in(0,1.8) and one turning point in z(0,0.9)z\in (0,0.9), and wde(z)w_{de}(z) could be oscillating around w=1w=-1. Moreover, we find that there is a 2σ2\sigma deviation of wdew_{de} from -1 around z=0.9z=0.9 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