Observational constraints on the accelerating universe in the framework of a 5D bounce cosmological model |
| |
Authors: | Lü Jian-Bo Xu Li-Xin Liu Mo-Lin Gui Yuan-Xing |
| |
Affiliation: | School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China |
| |
Abstract: | In the framework of a five-dimensional (5D) bounce cosmologicalmodel, a useful function $f(z)$ is obtained by giving a concreteexpression of deceleration parameter $q(z)=q_1+dfrac{q_2}{1+ln (1+z)}$. Then using the obtained Hubble parameter $H(z)$ according tothe function $f(z)$, we constrain the accelerating universe fromrecent cosmic observations: the 192 ESSENCE SNe Ia and the 9observational $H(z)$ data. The best fitting values of transitionredshift $z_T$ and current deceleration parameter $q_0 $ are givenas $z_T = 0.65_{ - 0.12}^{ + 0.25} $ and $q_0 = - 0.76_{ - 0.15}^{ +0.15} (1sigma )$. Furthermore, in the 5D bounce model it can beseen 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 currentvalue $w_{rm 0de} = - 1.15<- 1$. On the other hand, by giving aconcrete expression of model-independent EOS of dark energy $w_{rmde} $, in the 5D bounce model we obtain the best fitting values $z_T= 0.66_{ - 0.08}^{ + 0.11} $ and $q_0 = - 0.69_{ - 0.10}^{ + 0.10}(1sigma)$ from the recently observed data: the 192 ESSENCE SNe Ia,the observational $H(z)$ data, the 3-year Wilkinson MicrowaveAnisotropy Probe (WMAP), the Sloan Digital Sky Survey (SDSS) baryonacoustic peak and the x-ray gas mass fraction in clusters. |
| |
Keywords: | bounce cosmology decelerationparameter equation of state (EOS) dark energy (DE) |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|