http://arxiv.org/abs/2211.09617
While the probability density function (PDF) of the cosmic microwave background (CMB) convergence field approximately follows a Gaussian distribution, small contributions from structures at low redshifts make the overall distribution slightly non-Gaussian. Some of this late-time component can be modelled using the distribution of galaxies and subtracted off from the original CMB lensing map to produce a map of matter distribution at high redshifts. Using this high-redshift mass map, we are able to directly study the early phases of structure formation and look for deviations from our standard model. In this work, we forecast the detectability of signatures of non-Gaussianity due to nonlinear structure formation at $z>1.2$. Although we find that detecting such signatures using ongoing surveys will be challenging, we forecast that future experiments such as the CMB-S4 will be able to make detections of $\sim$ 7$\sigma$.
Z. Zhang, Y. Omori and C. Chang
Fri, 18 Nov 22
27/70
Comments: 9 pages, 9 figures. Comments welcome