论文标题
LATETIME宇宙学的运动学模型和状态基诊断
Kinematical models of latetime cosmology and the statefinder diagnostic
论文作者
论文摘要
目前的工作涉及拉比宇宙学的运动学模型。它基于关于减速参数的纯粹现象学假设。这些模型面临着IA型超新星距离距离模量测量的观察数据集和在不同红移处的哈勃参数的测量。 Markov Chanin Monte Charlo（MCMC）分析使用观察数据集获得了对宇宙学参数的约束。目前的哈勃参数，减速参数以及从减速到加速阶段的延伸阶段的红移的值估计了当前的运动模型。此外，通过一般相对论假设探索了当前模型的暗能量的性能。深色能量诊断，即OM诊断和置型诊断，用于比较当前模型。由两个不同的状态基础参数构建的相空间破坏了模型的堕落。观察到的运动模型在进化过程中实现了相空间上的相应λCDM值。对于当前的运动学模型，还研究了线性水平的物质密度对比度的演变。
The present work deals with kinematical models of latetime cosmology. It is based on purely phenomenological assumption about the deceleration parameter. The models are confronted to observational data sets of type Ia supernovae distance modulus measurements and measurements of Hubble parameter at different redshift. Constraints on the cosmological parameters are obtained by Markov Chanin Monte Charlo (MCMC) analysis using the observation data sets. The values of present Hubble parameter, deceleration parameter and the redshift of transition from decelerated to accelerated phase of expansion are estimated for the present kinematical models. Further the properties of dark energy for the present models are explored with general relativistic assumptions. The dark energy diagnostics, namely the Om diagnostic and the statefinder are adopted for a comparison of the present models. A phase space constructed of two different statefinder parameters breaks the degeneracy of the models. It is observed that the kinematical models attain the corresponding ΛCDM value on the phase space in the course of evolution. The evolution of matter density contrast at linear level has also been studied for the present kinematical models.
