Assessing the growth of structure over cosmic time with CMB lensing
Abstract
The standard CDM cosmological model informed by cosmic microwave background (CMB) anisotropies makes a precise prediction for the growth of matter density fluctuations over cosmic time on linear scales. A variety of cosmological observables offer independent and complementary ways of testing this prediction, but results have been mixed, with many constraints on the amplitude of structure being 2-3 lower than the expectation from Planck primary CMB anisotropies. It is currently unclear whether these discrepancies are due to observational systematics, non-linearities and baryonic effects or new physics. We review how gravitational lensing of the CMB has and will continue to provide insights into this problem, including through tomographic cross-correlations with galaxy surveys over cosmic time.
Keywords
Cite
@article{arxiv.2411.08152,
title = {Assessing the growth of structure over cosmic time with CMB lensing},
author = {Mathew S. Madhavacheril},
journal= {arXiv preprint arXiv:2411.08152},
year = {2024}
}
Comments
This is a review based on a talk I was invited to give at the Royal Society Meeting "Challenging the standard cosmological model" (London, April 2024). This matches the version accepted for publication in "Philosophical Transactions of the Royal Society A" (Accepted Oct 2024). 35 pages, 4 figures