论文标题
标量场模型中的扰动，优点为$λ$ cdm
Perturbations in a scalar field model with virtues of $Λ$CDM
论文作者
论文摘要
在精确宇宙学的时代，宇宙常数$λ$对宇宙的演变进行了相当准确的描述，但仍然困扰着微调问题和宇宙巧合问题。在这项工作中，我们调查了标量场模型中的扰动，该模型以类似的方式驱动近期加速度，宇宙常数具有类似的方式，并且具有与暗物质（DM）能量密度相当的深色能量（de）密度，从任意初始条件开始。扰动表明，尽管该模型保持了$λ$ CDM型号的优点，但具有独特的定性功能，尤其是它以$ 8 h^{ - 1} \，\ mbox {mpc} $，$σ_，$σ_{8} $的规模降低了物质功率谱的幅度。
In the era of precision cosmology, the cosmological constant $Λ$ gives quite an accurate description of the evolution of the Universe, but it is still plagued with the fine-tuning problem and the cosmic coincidence problem. In this work, we investigate the perturbations in a scalar field model that drives the recent acceleration in a similar fashion that the cosmological constant does and has the dark energy (DE) density comparable to the dark matter (DM) energy density at the recent epoch starting from arbitrary initial conditions. The perturbations show that this model, though it keeps the virtues of a $Λ$CDM model, has a distinctive qualitative feature, particularly it reduces the amplitude of the matter power spectrum on a scale of $8 h^{-1}\, \mbox{Mpc}$, $σ_{8}$ at the present epoch.
