利用ESSENCE和Gold超新星数据结合其他宇宙学探测对加速宇宙的约束
Constraints on accelerating universe using ESSENCE and Gold supernovae data combined with other cosmological probes
摘要：
我们使用最近观察到的数据：192颗ESSENCE Ia型超新星（SNe Ia）、182颗Gold Ia型超新星、3年WMAP、SDSS重子声峰、星团中X射线气体质量分数和观测$H(z)$数据，以约束加速宇宙模型。结合192个ESSENCE数据和观测的$H(z)$数据约束一个参数化的减速参数，得到了跃迁红移和电流减速参数$z_{T}=0.632^{+0.256}_{-0.127}$，$q_{0}=-0.788^{+0.182}_{-0.182}$的最佳拟合值。进一步，利用$Λ$ CDM模型和两个模型无关的暗能量状态方程，我们发现192个ESSENCE数据和其他四个宇宙学观测的组合约束得到的$Ω_{0m}$和$q_{0}$值比182个Gold数据和其他四个观测的组合约束小，但$z_{T}$值比182个Gold数据和其他四个观测的组合约束大.最后，根据赤池信息准则，它表明，最近观察到的数据同样支持三个暗能量模型：$Λ$ CDM，$w_{de}(z)=w_{0}$和$w_{de}(z)=w_{0}+w_{1}\ln(1+z)$。
英文摘要：
We use recently observed data: the 192 ESSENCE type Ia supernovae (SNe Ia), the 182 Gold SNe Ia, the 3-year WMAP, the SDSS baryon acoustic peak, the X-ray gas mass fraction in clusters and the observational $H(z)$ data to constrain models of the accelerating universe. Combining the 192 ESSENCE data with the observational $H(z)$ data to constrain a parameterized deceleration parameter, we obtain the best fit values of transition redshift and current deceleration parameter $z_{T}=0.632^{+0.256}_{-0.127}$, $q_{0}=-0.788^{+0.182}_{-0.182}$. Furthermore, using $Λ$CDM model and two model-independent equation of state of dark energy, we find that the combined constraint from the 192 ESSENCE data and other four cosmological observations gives smaller values of $Ω_{0m}$ and $q_{0}$, but a larger value of $z_{T}$ than the combined constraint from the 182 Gold data with other four observations. Finally, according to the Akaike information criterion it is shown that the recently observed data equally supports three dark energy models: $Λ$CDM, $w_{de}(z)=w_{0}$ and $w_{de}(z)=w_{0}+w_{1}\ln(1+z)$.
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