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arXiv 1110.0502astro-ph.COhep-phhep-th
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超轻轴子:大质量中微子的简并和未来宇宙学观测的预测

Ultra-light Axions: Degeneracies with Massive Neutrinos and Forecasts for Future Cosmological Observations

David J. E. Marsh, Edward Macaulay, Maxime Trebitsch, Pedro G. Ferreira

摘要:

弦论的一个普遍预言是存在许多轴子场。最近有人认为,许多这些领域应该是轻的,像众所周知的QCD轴子,导致可观察到的宇宙学后果。本文详细研究了所谓的弦轴宇宙对大尺度结构的影响,重点是密度扰动的形态和演化、宇宙微波背景的各向异性以及遥远星系的弱引力透镜。我们量化的具体影响,将出现从存在的轴子字段和突出可能的简并,可能会出现在大规模中微子的存在。我们特别注意理解不同的物理效果和尺度。然后,我们预测弦轴向宇宙可能会受到约束,并表明,与不同的观察相结合,它应该有可能检测到一小部分的超轻轴子的暗物质的百分之几。

英文摘要:

A generic prediction of string theory is the existence of many axion fields. It has recently been argued that many of these fields should be light and, like the well known QCD axion, lead to observable cosmological consequences. In this paper we study in detail the effect of the so-called string axiverse on large scale structure, focusing on the morphology and evolution of density perturbations, anisotropies in the cosmic microwave background and weak gravitational lensing of distant galaxies. We quantify specific effects that will arise from the presence of the axionic fields and highlight possible degeneracies that may arise in the presence of massive neutrinos. We take particular care understanding the different physical effects and scales that come into play. We then forecast how the string axiverse may be constrained and show that with a combination of different observations, it should be possible to detect a fraction of ultralight axions to dark matter of a few percent.

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