从SNe Ia Union数据看跃迁红移的运动学约束
Kinematic Constraints to the Transition Redshift from SNe Ia Union Data
摘要：
宇宙学检验的运动学方法为宇宙目前的加速阶段提供了直接的证据，它不依赖于广义相对论的有效性，也不依赖于宇宙的物质能量含量。在这种情况下，我们认为在这里的减速参数，$q(z)=q_0+q_1z$，其中$q_0$和$q_1$是任意常数被约束的联盟超新星数据的线性两参数扩展。假设宇宙是平坦的，我们发现自由参数对的最佳拟合是（$q_0,q_1$）=（$-0.73,1.5)$），而跃迁红移是$z_t = 0.49^{+0.14}_{-0.07}$（$1σ$）$^{+0.54}_{-0.12}$（$2σ$）。这个运动学结果与一些独立的分析是一致的，并且更容易容纳许多动力学平板模型（如$Λ$ CDM）。
英文摘要：
The kinematic approach to cosmological tests provides a direct evidence to the present accelerating stage of the universe which does not depend on the validity of general relativity, as well as on the matter-energy content of the Universe. In this context, we consider here a linear two-parameter expansion for the decelerating parameter, $q(z)=q_0+q_1z$, where $q_0$ and $q_1$ are arbitrary constants to be constrained by the Union supernovae data. By assuming a flat Universe we find that the best fit to the pair of free parameters is ($q_0,q_1$) = ($-0.73,1.5)$ whereas the transition redshift is $z_t = 0.49^{+0.14}_{-0.07}$ ($1σ$) $^{+0.54}_{-0.12}$ ($2σ$). This kinematic result is in agreement with some independent analyzes and accommodates more easily many dynamical flat models (like $Λ$CDM).
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。
