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arXiv 0801.2017astro-phgr-qc
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标量场暗能量微扰及其尺度依赖性

Scalar Field Dark Energy Perturbations and their Scale Dependence

Sanil Unnikrishnan, H. K. Jassal, T. R. Seshadri

备注：
12 pages, 13 figures, added new section, accepted for publication in Phys. Rev. D
发表信息：
Phys.Rev.D78:123504,2008
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摘要：

我们估计了具有指数势的精粹模型在不同尺度下暗能量的微扰幅度。结果表明，在比哈勃半径小得多的尺度上，暗能量的扰动与暗物质的扰动相比可以忽略不计。然而，在与哈勃半径（$λ_{p}>1000\mathrm{Mpc}$）相当的尺度上，暗能量的扰动一般不能忽略。与$Λ$ CDM模型相比，通用的精粹暗能量模型抑制了大尺度物质的功率谱。我们发现，在尺度$λ_{p} < 1000\mathrm{Mpc}$，这种抑制主要是由于不同的背景演变相比，$Λ$ CDM模型。然而，在更大的尺度上，暗能量的微扰可以显著地影响物质的功率谱。因此，本文的分析可以作为$Λ$ CDM模型与其他具有$w_{de} \neq -1$的一般暗能量模型的比较。

英文摘要：

We estimate the amplitude of perturbation in dark energy at different length scales for a quintessence model with an exponential potential. It is shown that on length scales much smaller than hubble radius, perturbation in dark energy is negligible in comparison to that in in dark matter. However, on scales comparable to the hubble radius ($λ_{p}>1000\mathrm{Mpc}$) the perturbation in dark energy in general cannot be neglected. As compared to the $Λ$CDM model, large scale matter power spectrum is suppressed in a generic quintessence dark energy model. We show that on scales $λ_{p} < 1000\mathrm{Mpc}$, this suppression is primarily due to different background evolution compared to $Λ$CDM model. However, on much larger scales perturbation in dark energy can effect matter power spectrum significantly. Hence this analysis can act as a discriminator between $Λ$CDM model and other generic dark energy models with $w_{de} \neq -1$.

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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