Please wait a minute...
Chin. Phys. B, 2009, Vol. 18(4): 1711-1720    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(吕剑波), Xu Li-Xin(徐立昕), Liu Mo-Lin(刘墨林), and Gui Yuan-Xing(桂元星)
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 $q(z)=q_1+\dfrac{q_2}{1+\ln (1+ z)}$. 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 $z_T$ and current deceleration parameter $q_0 $ are given as $z_T = 0.65_{ - 0.12}^{ + 0.25} $ and $q_0 = - 0.76_{ - 0.15}^{ + 0.15} (1\sigma )$. Furthermore, in the 5D bounce model it can be seen that the  evolution of equation of state (EOS) for dark energy $w_{\rm de} $ can cross over $-1$ at about $z=0.23$ and the current value $w_{\rm 0de} = - 1.15<- 1$. On the other hand, by giving a concrete expression of model-independent  EOS of dark energy $w_{\rm de} $, in the 5D bounce model we obtain the best fitting values $z_T = 0.66_{ - 0.08}^{ + 0.11} $ and $q_0 = - 0.69_{ - 0.10}^{ + 0.10} (1\sigma)$ 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:  bounce cosmology      deceleration parameter      equation of state (EOS)      dark energy (DE)  
Received:  11 July 2008      Revised:  18 August 2008      Accepted manuscript online: 
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(吕剑波), Xu Li-Xin(徐立昕), Liu Mo-Lin(刘墨林), and Gui Yuan-Xing(桂元星) Observational constraints on the accelerating universe in the framework of a 5D bounce cosmological model 2009 Chin. Phys. B 18 1711

[1] Reconstructing dark energy potentials from parameterized deceleration parameters
Wang Yu-Ting(王钰婷), Xu Li-Xin(徐立昕), Lü Jian-Bo(吕剑波), and Gui Yuan-Xing(桂元星) . Chin. Phys. B, 2010, 19(1): 019801.
No Suggested Reading articles found!