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Perturbations in a scalar field model with virtues of ΛCDM
Journal of Cosmology and Astroparticle Physics ( IF 6.4 ) Pub Date : 2021-04-21 , DOI: 10.1088/1475-7516/2021/04/060
Srijita Sinha 1 , Narayan Banerjee 1
Affiliation  

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 ΛCDM model, has a distinctive qualitative feature, particularly it reduces the amplitude of the matter power spectrum on a scale of 8 h-1 Mpc, σ8 at the present epoch.



中文翻译:

具有ΛCDM优点的标量场模型中的扰动

在精密宇宙学时代,宇宙学常数Λ对宇宙的演化给出了相当准确的描述,但它仍然受到微调问题和宇宙巧合问题的困扰。在这项工作中,我们研究了标量场模型中的扰动,该模型以与宇宙学常数类似的方式驱动最近的加速,并且暗能量 (DE) 密度与最近纪元的暗物质 (DM) 能量密度相当从任意初始条件开始。扰动表明,该模型虽然保留了ΛCDM模型的优点,但具有显着的定性特征,特别是在当前纪元8 h -1 Mpc,σ 8的尺度上降低了物质功率谱的幅度。

更新日期:2021-04-21
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