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arXiv 0909.0007astro-ph.CO
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指纹暗能量

Fingerprinting dark energy

Domenico Sapone, Martin Kunz

摘要:

暗能量扰动通常被忽略,或者以纯粹的数值方式包含在内,模糊了它们对状态方程或声速等基本参数的依赖性。然而,虽然对暗能量的许多不同解释可以具有相同的状态方程,但它们通常在扰动方面不同,因此这些提供了一个指纹,用于区分具有相同状态方程的不同模型。在本文中,我们推导出简单而准确的近似,能够表征一类特定的模型(包括大多数标量场模型),这通常被称为“暗能量“。然后,我们使用近似的解决方案,看看在暗物质功率谱和集成的萨克斯-沃尔夫效应的宇宙微波背景辐射的暗能量扰动的影响。

英文摘要:

Dark energy perturbations are normally either neglected or else included in a purely numerical way, obscuring their dependence on underlying parameters like the equation of state or the sound speed. However, while many different explanations for the dark energy can have the same equation of state, they usually differ in their perturbations so that these provide a fingerprint for distinguishing between different models with the same equation of state. In this paper we derive simple yet accurate approximations that are able to characterize a specific class of models (encompassing most scalar-field models) which is often generically called "dark energy". We then use the approximate solutions to look at the impact of the dark energy perturbations on the dark matter power spectrum and on the integrated Sachs-Wolfe effect in the cosmic microwave background radiation.

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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