Observational constraints on the accelerating universe in the framework of a 5D bounce cosmological model |
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Authors: | Lü Jian-Bo Xu Li-Xin Liu Mo-Lin Gui Yuan-Xing |
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Affiliation: | School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China |
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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. |
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Keywords: | bounce cosmology deceleration
parameter equation of state (EOS) dark energy (DE) |
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