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arXiv 1206.4479astro-ph.COgr-qchep-phhep-th
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CMB μ畸变的流体动力学研究

A Hydrodynamical Approach to CMB mu-distortions

Enrico Pajer, Matias Zaldarriaga

摘要:

宇宙微波背景的光谱畸变提供了一个独特的机会,通过进行大尺度测量来探测非常小尺度上的原始扰动。我们讨论了在一个系统的和教学的方式,所有相关的物理现象中涉及的生产和演变的μ型光谱失真。我们的主要结果同意以前的估计(特别是我们表明,最近发现的3/4的因素来自相对论修正波能量)。我们还讨论了绝热冷却、体粘滞效应、重子加载效应和光子热传导效应等几种次主导修正。最后,我们计算了μ-时代结束到现在之间的μ-失真的传递函数。

英文摘要:

Spectral distortion of the cosmic microwave background provides a unique opportunity to probe primordial perturbations on very small scales by performing large-scale measurements. We discuss in a systematic and pedagogic way all the relevant physical phenomena involved in the production and evolution of the mu-type spectral distortion. Our main results agree with previous estimates (in particular we show that a recently found factor of 3/4 arises from relativistic corrections to the wave energy). We also discuss several subleading corrections such as adiabatic cooling and the effects of bulk viscosity, baryon loading and photon heat conduction. Finally we calculate the transfer function for mu-distortions between the end of the mu-era and now.

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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