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arXiv 2203.08560astro-ph.COgr-qc
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宇宙双折射是由暗能量还是暗物质引起的?一种层析成像方法

Is cosmic birefringence due to dark energy or dark matter? A tomographic approach

Hiromasa Nakatsuka, Toshiya Namikawa, Eiichiro Komatsu

摘要:

赝标量“类轴子”场$ϕ$可以解释在宇宙微波背景(CMB)偏振数据的$EB$功率谱中观察到的宇宙双折射的$3σ$暗示。$ϕ$是暗能量还是暗物质?层析成像方法可以回答这个问题。造成今天宇宙加速膨胀的暗能量场的有效质量必须小于$m_ϕ\simeq 10^{-33}$ eV。如果$m_ϕ\gtrsim 10^{-32}$ eV,则$ϕ$在再电离时期之前开始演变,并且我们应该在低($l\lesssim 10$)和高多极子下从$EB$功率谱观察到不同量的双折射。这样的观测需要全天空的卫星任务,将排除$ϕ$是暗能量的可能性。如果$m_ϕ\gtrsim 10^{-28}$ eV,$ϕ$在复合时期开始振荡,在高多极的$EB$功率谱中留下明显的特征,这可以通过地面CMB观测精确测量。我们的层析成像方法依赖于$EB$功率谱的形状,并且对偏振角的误校准不太敏感。

英文摘要:

A pseudoscalar "axionlike" field, $ϕ$, may explain the $3σ$ hint of cosmic birefringence observed in the $EB$ power spectrum of the cosmic microwave background (CMB) polarization data. Is $ϕ$ dark energy or dark matter? A tomographic approach can answer this question. The effective mass of dark energy field responsible for the accelerated expansion of the Universe today must be smaller than $m_ϕ\simeq 10^{-33}$ eV. If $m_ϕ\gtrsim 10^{-32}$ eV, $ϕ$ starts evolving before the epoch of reionization and we should observe different amounts of birefringence from the $EB$ power spectrum at low ($l\lesssim 10$) and high multipoles. Such an observation, which requires a full-sky satellite mission, would rule out $ϕ$ being dark energy. If $m_ϕ\gtrsim 10^{-28}$ eV, $ϕ$ starts oscillating during the epoch of recombination, leaving a distinct signature in the $EB$ power spectrum at high multipoles, which can be measured precisely by ground-based CMB observations. Our tomographic approach relies on the shape of the $EB$ power spectrum and is less sensitive to miscalibration of polarization angles.

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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