https://doi.org/10.1140/epjc/s10052-012-1883-7
Regular Article - Theoretical Physics
Revisiting generalized Chaplygin gas as a unified dark matter and dark energy model
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
Department of Physics, Liaoning Normal University, Dalian, 116029, People’s Republic of China
5
Institute of Cosmology & Gravitation, University of Portsmouth, Portsmouth, PO1 3FX, UK
* e-mail: lxxu@dlut.edu.cn
Received:
25
December
2011
Revised:
19
January
2012
Published online:
14
February
2012
In this paper, we revisit the generalized Chaplygin gas (GCG) model as a unified dark matter and dark energy model. The energy density of GCG model is given as ρ
GCG/ρ
GCG0=[B
s
+(1−B
s
)a
−3(1+α)]1/(1+α), where α and B
s
are two model parameters which will be constrained by type Ia supernova as standard candles, baryon acoustic oscillation as standard rulers and the seventh year full WMAP data points. In this paper, we will not separate GCG into dark matter and dark energy parts any more as adopted in the literature. By using the Markov Chain Monte Carlo method, we find the results 
and 
.
© Springer-Verlag / Società Italiana di Fisica, 2012
