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Chin. Phys. B, 2009, Vol. 18(4): 01711    DOI: 10.1088/1674-1056/18/4/072
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS Prev  

Observational constraints on the accelerating universe in the framework of a 5D bounce cosmological model

Lü Jian-Bo, Xu Li-Xin, Liu Mo-Lin, Gui Yuan-Xing
School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
Abstract  In the framework of a five-dimensional (5D) bounce cosmological model, a useful function f(z) is obtained by giving a concrete expression of deceleration parameter q(z)=q1+{q2}/{1+ln (1+ z)}. Then using the obtained Hubble parameter H(z) according to the function f(z), we constrain the accelerating universe from recent cosmic observations: the 192 ESSENCE SNe Ia and the 9 observational H(z) data. The best fitting values of transition redshift zT and current deceleration parameter q0 are given as zT= 0.65-0.120.25 and q0 = - 0.76-0.15+0.15 (1σ). Furthermore, in the 5D bounce model it can be seen that the evolution of equation of state (EOS) for dark energy wde can cross over -1 at about z=0.23 and the current value w0de= - 1.15<- 1. On the other hand, by giving a concrete expression of model-independent EOS of dark energy wde, in the 5D bounce model we obtain the best fitting values zT= 0.660.08+0.11 and q0 = - 0.690.10+0.10 (1σ) from the recently observed data: the 192 ESSENCE SNe Ia, the observational H(z) data, the 3-year Wilkinson Microwave Anisotropy Probe (WMAP), the Sloan Digital Sky Survey (SDSS) baryon acoustic peak and the x-ray gas mass fraction in clusters.
Keywords:  deceleration parameter      equation of state (EOS)      bounce cosmology      dark energy (DE)  
Received:  11 July 2008      Revised:  18 August 2008      Published:  20 April 2009
PACS:  98.80.Cq (Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.))  
  98.80.Es (Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc))  
  95.36.+x (Dark energy)  
  98.70.Vc (Background radiations)  
  97.60.Bw (Supernovae)  
  98.62.Py (Distances, redshifts, radial velocities; spatial distribution of galaxies)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10573004 and 10703001), and Specialized Research Fund for the Doctoral Program of Higher Education (Grant No 2007141034).

Cite this article: 

Lü Jian-Bo, Xu Li-Xin, Liu Mo-Lin, Gui Yuan-Xing Observational constraints on the accelerating universe in the framework of a 5D bounce cosmological model 2009 Chin. Phys. B 18 01711

[1] Reconstructing dark energy potentials from parameterized deceleration parameters
Wang Yu-Ting, Xu Li-Xin, Lü Jian-Bo, Gui Yuan-Xing. Chin. Phys. B, 2010, 19(1): 019801.
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