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arXiv 2104.00982astro-ph.COgr-qc
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快子暗能量与Quintessence暗能量:线性扰动和CMB数据

Tachyonic vs Quintessence dark energy: linear perturbations and CMB data

Manvendra Pratap Rajvanshi, Avinash Singh, H. K. Jassal, J. S. Bagla

摘要:

我们利用线性微扰理论研究了动力学暗能量模型中的微扰。我们比较了具有相同背景演化的精粹和快子暗能量模型。我们将不同模型的相应方程写成一种形式,使我们更容易看出这两个模型在线性区域中很难区分,特别是对于具有$(1 + w) \ll 1$的模型。我们使用宇宙微波背景数据和参数表示的两个模型来说明,他们不能区分相同的背景演化与现有的观测。此外,我们约束快子模型与普朗克数据。我们这样做的分析指数和平方反比的潜力,并发现,潜在的内参数仍然非常弱的约束。特别是在低红移观测所允许的范围内。

英文摘要:

We use linear perturbation theory to study perturbations in dynamical dark energy models. We compare quintessence and tachyonic dark energy models with identical background evolution. We write the corresponding equations for different models in a form that makes it easier to see that the two models are very hard to distinguish in the linear regime, especially for models with $(1 + w) \ll 1$. We use Cosmic Microwave Background data and parametric representations for the two models to illustrate that they cannot be distinguished for the same background evolution with existing observations. Further, we constrain tachyonic models with the Planck data. We do this analysis for exponential and inverse square potentials and find that the intrinsic parameters of the potentials remain very weakly constrained. In particular, this is true in the regime allowed by low redshift observations.

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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