Normally a CMB photon is first blueshifted (its peak shifts towards the blue end of the spectrum) when it enters the supercluster and then redshifted as it leaves, so that the two effects cancel.
By using the concept of "coherence area", we standardized three familiar statements about the spatial coherence criterion on a photon correlation spectrum measurement system.
利用相干面积概念对光子相关谱测量系统空间相干性判据的几种常见表述进行了规范。
3
Using a simplified model of light interference, we discussed the physical essence of the spatial coherence demand on a photon correlation spectrum measurement system in dynamic light scattering.