arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.1871astro-ph.CO
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最新观测资料对运动学模式的限制

Constraints on kinematic models from the latest observational data

Jianbo Lu, Lixin Xu, Molin Liu

摘要:

运动学模型受到来自几何距离测量的最新观测数据的约束,其中包括557个Ia型超新星(SNIa)Union2数据和15个哈勃观测数据。考虑两个参数化的减速参数,得到了当前减速参数$q_{0}$、加加速度参数$j_{0}$和跃迁红移$z_{T}$的值。此外,根据加加速度参数$j(z)$的变化,给出了两种参数化运动学模型与$Λ$ CDM模型的偏差。此外,它表明,加加速度参数$j(z)$的约束是弱的,由目前的几何观测数据。

英文摘要:

Kinematical models are constrained by the latest observational data from geometry-distance measurements, which include 557 type Ia supernovae (SNIa) Union2 data and 15 observational Hubble data. Considering two parameterized deceleration parameter, the values of current deceleration parameter $q_{0}$, jerk parameter $j_{0}$ and transition redshift $z_{T}$, are obtained. Furthermore, we show the departures for two parameterized kinematical models from $Λ$CDM model according to the evolutions of jerk parameter $j(z)$. Also, it is shown that the constraint on jerk parameter $j(z)$ is weak by the current geometrical observed data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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