Eur. Phys. J. C (2017) 77: 894
https://doi.org/10.1140/epjc/s10052-017-5468-3

Regular Article - Theoretical Physics

Late-time acceleration with steep exponential potentials

¹ Institute for Advanced Physics and Mathematics, Zhejiang University of Technology, Hangzhou, 310032, People’s Republic of China
² Department of Physics, Liaoning Normal University, Dalian, 116029, People’s Republic of China
³ Department of General and Theoretical Physics, Eurasian International Center for Theoretical Physics, Eurasian National University, Astana, 010008, Kazakhstan
⁴ GCAP-CASPER, Department of Physics, Baylor University, Waco, TX, 76798-7316, USA

^* e-mail: shahalam@zjut.edu.cn

Received: 26 November 2017
Accepted: 13 December 2017
Published online: 20 December 2017

Abstract

In this letter, we study the cosmological dynamics of steeper potential than exponential. Our analysis shows that a simple extension of an exponential potential allows to capture late-time cosmic acceleration and retain the tracker behavior. We also perform statefinder and Om diagnostics to distinguish dark energy models among themselves and with CDM. In addition, to put the observational constraints on the model parameters, we modify the publicly available CosmoMC code and use an integrated data base of baryon acoustic oscillation, latest Type Ia supernova from Joint Light Curves sample and the local Hubble constant value measured by the Hubble Space Telescope.