Impacts of different SNLS3 light-curve fitters on cosmological consequences of interacting dark energy models

¹ State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190 Beijing, PR China
e-mail: wangshuang@mail.sysu.edu.cn
² Kavli Institute for Theoretical Physics China, Chinese Academy of Sciences, 100190 Beijing, PR China
³ School of Astronomy and Space Science, Sun Yat-Sen University, 510275 Guangzhou, PR China

Received: 12 July 2015
Accepted: 23 May 2016

Abstract

We explore the cosmological consequences of interacting dark energy (IDE) models using the SNLS3 supernova samples. In particular, we focus on the impacts of different SNLS3 light-curve fitters (LCF; referred to in this paper as SALT2, SiFTO and combined sample). Firstly, making use of the three SNLS3 data sets, as well as the Planck distance priors data and the galaxy clustering data, we constrain the parameter spaces of three IDE models. Then, we study the cosmic evolutions of Hubble parameter H(z), deceleration diagram q(z), statefinder hierarchy S⁽¹⁾₃(z) and S⁽¹⁾₄(z), and check whether or not these dark energy diagnosis can distinguish the differences among the results of different SNLS3 LCF. Finally, we perform a high redshift cosmic age test using three old high redshift objects (OHRO), and explore the fate of the Universe. We find that the impacts of different SNLS3 LCF are rather small, and can not be distinguished using H(z), q(z), S⁽¹⁾₃(z), S⁽¹⁾₄(z), and the age data of OHRO. In addition, we infer, from the current observations, how far we are from a cosmic doomsday in the worst case, and find that the combined sample always gives the largest 2σ lower limit of the time interval between “big rip” and today, while the results given by the SALT2 and the SiFTO sample are similar. These conclusions are insensitive to a specific form of dark sector interaction. Our method can be used to distinguish the differences among various cosmological observations.