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arXiv 2203.09409astro-ph.COhep-ph
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来自单向轴子暗能量的宇宙双光子

Cosmic Birefringence from Monodromic Axion Dark Energy

Silvia Gasparotto, Ippei Obata

摘要:

最近报道的普朗克2018偏振数据中的非零各向同性双折射角为轴子的新物理学提供了诱人的暗示。在本文中,我们解释了这一点的弦论的动机轴子与monodromy潜在的暗能量的作用。在这种情况下,使用双折射测量和对暗能量状态方程的约束,我们发现一个上限的轴子衰减常数为$f_a \lesssim 10^{16}$ GeV。这自然地给出了一个GUT量级的能量标度,并解决了传统轴子暗能量模型的超普朗克场范围的理论问题。我们进一步研究了宇宙双折射对基本理论的影响,以及它对弦沼泽地结构的影响。最后,我们讨论了振荡功能的暗能量部门和预期的宇宙双折射层析成像。

英文摘要:

The recently reported non-zero isotropic birefringence angle in Planck 2018 polarization data provides a tantalizing hint for new physics of axions. In this paper, we explain this by a string theory motivated axion with a monodromy potential that plays the role of dark energy. Upon using the birefringence measurement and the constraint on the equation of state for dark energy in this scenario, we find an upper bound on the axion decay constant as $f_a \lesssim 10^{16}$ GeV. This naturally gives an energy scale of order GUT and can resolve the theoretical issue of super-Planckian field range of the conventional axion dark energy model. We further study the implications of cosmic birefringence for the underlying theory and its consequences for the string swampland conjectures. We finally discuss oscillatory features in the dark energy sector and the expected cosmic birefringence tomography.

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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