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arXiv 2209.07804astro-ph.COgr-qchep-ph
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早期暗能量的各向同性宇宙双折射

Isotropic cosmic birefringence from early dark energy

Kai Murai, Fumihiro Naokawa, Toshiya Namikawa, Eiichiro Komatsu

摘要:

在宇宙微波背景(CMB)偏振数据的$E B$互功率谱中发现了一个诱人的各向同性宇宙双折射的暗示,其统计显著性为$3σ$。通过陈-西蒙斯项耦合到CMB光子的赝标量场可以解释这种观察。同样的场也可能是早期暗能量(EDE)的原因,它解释了所谓的哈勃张力。由于EDE场在复合时期显着演变,因此将$E B$与$E$和$B$模式自动功率谱之间的差异联系起来的传统公式不再有效。求解玻尔兹曼方程的偏振光子和动力学的EDE场一致,我们发现,目前青睐的参数空间的EDE模型产生各种形状的$EB$频谱,这可以通过CMB实验进行测试。

英文摘要:

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the conventional formula that relates $E B$ to the difference between the $E$- and $B$-mode auto-power spectra is no longer valid.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.

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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