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arXiv 1508.06342astro-ph.COhep-phhep-th
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新物理学在CMB中的阶段

Phases of New Physics in the CMB

Daniel Baumann, Daniel Green, Joel Meyers, Benjamin Wallisch

摘要:

众所周知,宇宙中微子背景的涨落会在宇宙微波背景的声学峰值中产生相移。正是通过对这种效应的敏感性,最近的CMB数据提供了对自由流中微子的可靠探测。在本文中,我们重新审视的相位移的CMB各向异性谱作为一种新的物理探索。相移是特别有趣的,因为它的物理起源是强烈约束的格林函数的引力势的分析性质。对于绝热涨落,相移需要传播速度快于光子-重子等离子体中涨落速度的模式。这种可能性是通过自由流动的相对论粒子实现的,例如中微子或其他形式的暗辐射。可替代地,相移可以由等曲率波动引起。我们提出了简单的模型来说明这些影响。然后,我们提供观测约束普朗克温度和偏振数据的其他形式的辐射。我们还预测了未来CMB第四阶段实验的能力。只要有可能,我们给我们的结果的分析解释。

英文摘要:

Fluctuations in the cosmic neutrino background are known to produce a phase shift in the acoustic peaks of the cosmic microwave background. It is through the sensitivity to this effect that the recent CMB data has provided a robust detection of free-streaming neutrinos. In this paper, we revisit the phase shift of the CMB anisotropy spectrum as a probe of new physics. The phase shift is particularly interesting because its physical origin is strongly constrained by the analytic properties of the Green's function of the gravitational potential. For adiabatic fluctuations, a phase shift requires modes that propagate faster than the speed of fluctuations in the photon-baryon plasma. This possibility is realized by free-streaming relativistic particles, such as neutrinos or other forms of dark radiation. Alternatively, a phase shift can arise from isocurvature fluctuations. We present simple models to illustrate each of these effects. We then provide observational constraints from the Planck temperature and polarization data on additional forms of radiation. We also forecast the capabilities of future CMB Stage IV experiments. Whenever possible, we give analytic interpretations of our results.

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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