AI 中文总结
本文利用CosmoTherm的频率层级方法，研究含原初非高斯性的声学阻尼产生的CMB谱畸变各向异性，对比前人结果、分析小尺度曲率扰动影响，为原初非高斯性约束提供新途径。
AI 中文摘要
本文利用CosmoTherm的最新频率层级（FH）处理方法，评估了由不同温度黑体混合引起的精确畸变源和传递函数。借助该方法，我们能够评估原初非高斯性（PNG）对μT、μE、yT和yE交叉功率谱的影响，其中包括FH处理保留的耦合谱空间演化及重要光子输运效应。对于局域型PNG，我们将结果与前人工作对比，阐明了此前未被捕捉的新方面。随后，我们展示了小尺度曲率扰动增强时μT和μE信号的变化情况。对于近标度不变的原初谱，我们的结果在大角尺度上与前人估计大致吻合，但呈现出额外的小尺度阻尼，以及由加热源的标度依赖性和畸变扰动的不同输运导致的y畸变相关性修正。紧耦合与单极源近似可精确重现μ畸变谱，而y畸变信号对源演化细节仍更为敏感。对于增强的小尺度功率，畸变平均谱传播产生的各向异性可与各向异性耗散产生的各向异性相当。二者不同的角依赖性和参数标度原则上可实现小尺度功率振幅与原初非高斯性的单独约束。本文结果为利用现有及即将到来的高精度CMB各向异性数据在新领域研究PNG、测量原初畸变相关性铺平了道路。
英文摘要
In this paper, we evaluate the precise distortion source and transfer functions caused by mixing of blackbodies of different temperatures using the recently developed frequency hierarchy (FH) treatment of CosmoTherm. With this we are able to evaluate the effects of primordial non-Gaussianity (PNG) on the $μT$, $μE$, $y T$ and $y E$ cross-power spectra including the coupled spectro-spatial evolution and important photon-transport effects retained by the FH treatment. For local-type PNG, we compare our results with those from previous works, illustrating new aspects that were previously not captured. We then demonstrate how the $μT$ and $μE$ signals change in the presence of enhanced curvature perturbations at small scales. For a nearly scale-invariant primordial spectrum, our results agree broadly with previous estimates on large angular scales but exhibit additional small-scale damping and modified $y$-distortion correlations arising from the scale dependence of the heating source and the distinct transport of distortion perturbations. Tight-coupling and monopole-source approximations accurately reproduce the $μ$-distortion spectra, while the $y$-distortion signals remain more sensitive to the detailed source evolution. For enhanced small-scale power, anisotropies generated by propagation of the distorted average spectrum can become comparable to those from anisotropic dissipation. Their different angular dependences and parameter scalings principally allow the small-scale power amplitude and primordial non-Gaussianity to be constrained separately. The results presented here thus pave the path for studying PNG in new regimes using existing and upcoming high precision CMB anisotropy data to measure primordial distortion correlations.
Comments43 pages, 9 figures, to be submitted to JCAP, comments welcome
