论文标题
Atacama宇宙学望远镜：对宇宙双折射的约束
The Atacama Cosmology Telescope: Constraints on Cosmic Birefringence
论文作者
论文摘要
我们使用Atacama Cosmology望远镜的两个季节数据覆盖$ 456 $方形的天空，对宇宙微波背景极化的各向异性双折射进行了新的限制。使用弯曲的二次估计器测量的双发性功率谱与零一致。我们的结果为双方尺度范围介于$ 5 $ arcminutes和$ 9 $度的一系列角度范围内提供了最严格的折线限制。我们提高了以前的上限，对比例不断的双重功率谱的幅度提高了$ 2 $至3美元的倍数。假设在通货膨胀期间有几乎无质量的轴心场，我们的结果等于$ 2 \，σ$上限的轴轴耦合在轴和$ g_ {αγ} <4.0 \ times 10^{-2}/h_i $ h_i $ h_i $ h_i $ h_i $ h_i $ h_i as uppertiate us povertiate h_i as povertiate h_i as forthational hubble尺度中的轴和光子之间的耦合常数。
We present new constraints on anisotropic birefringence of the cosmic microwave background polarization using two seasons of data from the Atacama Cosmology Telescope covering $456$ square degrees of sky. The birefringence power spectrum, measured using a curved-sky quadratic estimator, is consistent with zero. Our results provide the tightest current constraint on birefringence over a range of angular scales between $5$ arcminutes and $9$ degrees. We improve previous upper limits on the amplitude of a scale-invariant birefringence power spectrum by a factor of between $2$ and $3$. Assuming a nearly-massless axion field during inflation, our result is equivalent to a $2\,σ$ upper limit on the Chern-Simons coupling constant between axions and photons of $g_{αγ}<4.0\times 10^{-2}/H_I$ where $H_I$ is the inflationary Hubble scale.
