Eur. Phys. J. C (2011) 71: 1588
https://doi.org/10.1140/epjc/s10052-011-1588-3

Regular Article - Theoretical Physics

Unifying dark energy and dark matter with the modified Ricci model

¹ Department of Physics and Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, Hunan Normal University, Changsha, Hunan, 410081, China
² College of Science, Wuhan Textile University, Wuhan, Hubei, 430074, China

^* e-mail: hwyu@hunnu.edu.cn

Received: 23 December 2010
Revised: 13 February 2011
Published online: 2 March 2011

Abstract

In this paper, two modified Ricci models are considered as the candidates of unified dark matter–dark energy. In model one, the energy density is given by , whereas, in model two, by . We find that they can explain both dark matter and dark energy successfully. A constant equation of state of dark energy is obtained in model one, which means that it gives the same background evolution as the wCDM model, while model two can give an evolutionary equation of state of dark energy with the phantom divide line crossing in the near past.