Cosmic birefringence tomography and calibration-independence with reionization signals in the CMB
Cosmic birefringence tomography and calibration-independence with reionization signals in the CMB
复制标题
宇宙双折射断层扫描和 CMB 中再电离信号的校准独立性
DOI：
10.1093/mnras/stac3146
复制
发表时间：
2021
影响因子：
4.8
通讯作者：
T. Namikawa
中科院分区：
文献类型：
--
作者：
B. Sherwin;T. Namikawa
在CMB中寻找宇宙极化旋转或双折射是有良好动机的，因为它可以为违反宇称的新物理提供强有力的约束，例如类轴子粒子。在本文中，我们指出，由于CMB偏振是在两个非常不同的红移上产生的--它是在重新电离和复合时产生的--新的宇称破坏物理通常可以将来自这些不同来源的偏振信号旋转不同的量。我们探讨了这一点的两个含义。首先，CMB双折射的测量是具有挑战性的，因为CMB偏振角的错误校准会使效应退化；然而，通过取重新电离和复合双折射角度的差异(从不同的CMB角度尺度测量)，我们可以获得不受仪器角度错误校准影响的宇宙学信号。其次，我们注意到，与其他探测双折射的方法相结合，可以提供层析信息，限制任何产生双折射的物理的红移起源。我们预测，对于像LiteBIRD这样的未来的CMB卫星，重新电离和复合双折射角度的差异可以竞争地确定到∼0.05度以内。虽然还需要进一步的工作，但我们认为，由于更大的信号和更低的前景，这种测量的前景缓解应该比类似规模的通货膨胀B模式搜索更具挑战性。
The search for cosmic polarization rotation or birefringence in the CMB is well-motivated because it can provide powerful constraints on parity-violating new physics, such as axion-like particles. In this paper we point out that since the CMB polarization is produced at two very different redshifts – it is generated at both reionization and recombination – new parity-violating physics can generically rotate the polarization signals from these different sources by different amounts. We explore two implications of this. First, measurements of CMB birefringence are challenging because the effect is degenerate with a miscalibration of CMB polarization angles; however, by taking the difference of the reionization and recombination birefringence angles (measured from different CMB angular scales), we can obtain a cosmological signal that is immune to instrumental angle miscalibration. Second, we note that the combination with other methods for probing birefringence can give tomographic information, constraining the redshift origin of any physics producing birefringence. We forecast that the difference of the reionization and recombination birefringence angles can be competitively determined to within ∼0.05 degrees for future CMB satellites such as LiteBIRD. Although much further work is needed, we argue that foreground mitigation for this measurement should be less challenging than for inflationary B-mode searches on similar scales due to larger signals and lower foregrounds.