https://doi.org/10.1140/epjc/s10052-014-2765-y
Regular Article - Theoretical Physics
Viscous generalized Chaplygin gas as a unified dark fluid: including perturbation of bulk viscosity
1
Institute of Theoretical Physics, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian , 116024, People’s Republic of China
2
Department of Physics, College of Mathematics and Physics, Bohai University, Jinzhou , 121013, People’s Republic of China
* e-mail: liweizhd@126.com
Received:
3
November
2013
Accepted:
30
November
2013
Published online:
20
February
2014
In this paper, we continue our previous work of studying viscous generalized Chaplygin gas as a unified dark fluid but the bulk viscosity perturbations. By using the currently available cosmic observational data from SNLS3, BAO, HST, and recently released Planck, we obtain a constraint on the bulk viscosity coefficient: 
in 
regions, respectively, via the Markov Chain Monte Carlo method. The result shows that when considering perturbations of the bulk viscosity, the current cosmic observations favor a smaller bulk viscosity coefficient.
© The Author(s), 2014
