标题： 利用CMB和再电离光学深度限制普朗克尺度物理 显示英文标题

标题： Constraining Planck scale physics with CMB and Reionization Optical Depth

摘要： 我们展示了早期宇宙物理与晚期观测之间双向相互作用的原理性证明。 我们发现，决定原初功率谱中大尺度功率抑制的原初机制与再电离光学深度 $\tau$ 的值之间存在关联。 这些机制可能会影响 $\tau$ 的估计。 我们表明，利用未来对 $\tau$ 的测量，可以对预膨胀动力学施加限制，从而为非常早期宇宙的物理提供一个新的视角。 此外，重新估算的 $\tau$ 可能解决高、低 $\ell$ 测量 $\tau$ 之间的适度差异，从而为功率抑制异常及其原初起源提供实证支持。 显示英文摘要

摘要： We present proof of principle for a two way interplay between physics at very early Universe and late time observations. We find a relation between primordial mechanisms responsible for large scale power suppression in the primordial power spectrum and the value of reionization optical depth $\tau$. Such mechanisms can affect the estimation of $\tau$. We show that using future measurements of $\tau$, one can obtain constraints on the pre-inflationary dynamics, providing a new window on the physics of the very early Universe. Furthermore, the new, re-estimated $\tau$ can potentially resolve moderate discrepancy between high and low-$\ell$ measurements of $\tau$, hence providing empirical support for the power suppression anomaly and its primordial origin.