https://doi.org/10.1140/epjc/s10052-012-1931-3
Regular Article - Theoretical Physics
Modified Chaplygin gas as a unified dark matter and dark energy model and cosmic constraints
1
Institute of Theoretical Physics, Dalian University of Technology, Dalian, 116024, People’s Republic of China
2
College of Advanced Science & Technology, Dalian University of Technology, Dalian, 116024, People’s Republic of China
3
Korea Astronomy and Space Science Institute, Yuseong Daedeokdaero 776, Daejeon, 305-348, R. Korea
4
Institute of Cosmology & Gravitation, University of Portsmouth, Portsmouth, PO1 3FX, UK
* e-mail: lxxu@dlut.edu.cn
Received:
6
February
2012
Revised:
4
March
2012
Published online:
15
March
2012
A modified Chaplygin gas model (MCG), ρ
MCG/ρ
MCG0=[B
s
+(1−B
s
)a
−3(1+B)(1+α)]1/(1+α), as a unified dark matter model and dark energy model, is constrained by using current available cosmic observational data points which include type Ia supernovae, baryon acoustic oscillation and the 7-year full WMAP data points. As a contrast to the consideration in the literature, we do not separate the MCG into two components, i.e. dark mater and dark energy component, but we take it as a whole energy component—a unified dark sector. By using a Markov Chain Monte Carlo method, a tight constraint is obtained: 
, 
and 
.
© Springer-Verlag / Società Italiana di Fisica, 2012
