Cosmic birefringence and electroweak axion dark energy
Cosmic birefringence and electroweak axion dark energy
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宇宙双折射和电弱轴子暗能量
DOI：
10.1103/physrevd.104.l101302
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发表时间：
2021
影响因子：
5
通讯作者：
T. Yanagida
中科院分区：
文献类型：
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作者：
Gongjun Choi;Weikang Lin;L. Visinelli;T. Yanagida
以最近报道的宇宙微波背景（CMB）线偏振非零旋转角β=0.35±0.14度作为赝Nambu-Goldstone玻色子精华暗能量（DE）的提示，我们研究了电弱（EW）轴子精华DE模型，其中轴子质量由EW瞬子产生。我们发现，一旦考虑到 DE 状态方程的当前约束，β 的观测值意味着一个非平凡的 U(1) 电磁异常系数 (cγ)。借助由实验推断的 cγ 启发的模型的假设高能结构，该模型被证明能够对精华 DE 的当前状态方程（wDE,0）进行预测。预计这将使我们的场景与宇宙学常数 (w = −1) 相比具有可区分性，并且在未来 wDE,0 的未来测量误差降至 O(1)% 水平 (δw = O(10)) 时可进行测试。
Taking the recently reported non-zero rotation angle of the cosmic microwave background (CMB) linear polarization β = 0.35±0.14 deg as the hint for a pseudo Nambu-Goldstone boson quintessence dark energy (DE), we study the electroweak (EW) axion quintessence DE model where the axion mass is generated by the EW instantons. We find that the observed value of β implies a non-trivial U(1) electromagnetic anomaly coefficient (cγ), once the current constraint on the DE equation of state is also taken into account. With the aid of the hypothetical high energy structure of the model inspired by the experimentally inferred cγ , the model is shown to be able to make prediction for the current equation of state (wDE,0) of the quintessence DE. This is expected to make our scenario distinguishable in comparison with the cosmological constant (w = −1) and testable in future when the error in the future measurement of wDE,0 is reduced to O(1)% level (δw = O(10)).