论文标题
早期黑暗能量的各向同性宇宙双折射
Isotropic cosmic birefringence from early dark energy
论文作者
论文摘要
在宇宙微波背景（CMB）极化数据的$ E B $跨功率中发现了各向同性宇宙双折射的诱人暗示，其统计学意义为$3σ$。通过Chern-Simons项耦合到CMB光子的伪级场可以解释这一观察结果。同一领域也可能导致早期的暗能量（EDE），这减轻了所谓的哈勃张力。由于EDE场在重组时期内发生了显着发展，因此将$ E B $与$ e $ - 和$ e $ - 和$ b $ mmode自动功率光谱之间的差异相关的常规公式不再有效。求解极化光子的Boltzmann方程和EDE场的动力学始终如一地发现，当前有利于EDE模型的参数空间会产生$ eb $ speptrum的多种形状，可以通过CMB实验测试。
A tantalizing hint of isotropic cosmic birefringence has been found in the $E B$ cross-power spectrum of the cosmic microwave background (CMB) polarization data with a statistical significance of $3σ$. A pseudoscalar field coupled to the CMB photons via the Chern-Simons term can explain this observation. The same field may also be responsible for early dark energy (EDE), which alleviates the so-called Hubble tension. Since the EDE field evolves significantly during the recombination epoch, the conventional formula that relates $E B$ to the difference between the $E$- and $B$-mode auto-power spectra is no longer valid. Solving the Boltzmann equation for polarized photons and the dynamics of the EDE field consistently, we find that currently favored parameter space of the EDE model yields a variety of shapes of the $EB$ spectrum, which can be tested by CMB experiments.
