Cosmic birefringence from monodromic axion dark energy
Cosmic birefringence from monodromic axion dark energy
复制标题
DOI：
10.1088/1475-7516/2022/08/025
复制
发表时间：
2022-03
影响因子：
6.4
通讯作者：
S. Gasparotto;Ippei Obata
中科院分区：
文献类型：
--
作者：
S. Gasparotto;Ippei Obata
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，我们通过弦理论激发的具有单势的轴子来解释这一现象，该轴子扮演暗能量的角色。利用双折射测量和对暗能量状态方程的约束，我们发现在这种情况下轴子衰变常数的上界为fa > 1016 GeV。这自然给出了一个GUT级的能量尺度，可以解决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础理论的影响及其对弦沼泽猜想的影响。我们最后讨论了暗能量部分的振荡特征和预期的宇宙双折射层析成像。
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 fa ≲ 1016 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.