PIRSA:25080049

Video URL

https://pirsa.org/25080049

Cosmic consistency tested over 12 billion years

Madhavacheril, M. (2025). Cosmic consistency tested over 12 billion years. Perimeter Institute for Theoretical Physics. https://pirsa.org/25080049

Madhavacheril, Mathew. Cosmic consistency tested over 12 billion years. Perimeter Institute for Theoretical Physics, Aug. 29, 2025, https://pirsa.org/25080049 

          @misc{ scivideos_PIRSA:25080049,
            doi = {10.48660/25080049},
            url = {https://pirsa.org/25080049},
            author = {Madhavacheril, Mathew},
            keywords = {Cosmology, Particle Physics, Strong Gravity},
            language = {en},
            title = {Cosmic consistency tested over 12 billion years},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2025},
            month = {aug},
            note = {PIRSA:25080049 see, \url{https://scivideos.org/index.php/pirsa/25080049}}
          }

Mathew Madhavacheril University of Pennsylvania

Talk numberPIRSA:25080049
DOI10.48660/25080049
Source RepositoryPIRSA
Collection
Talk Type Conference
Subject

Abstract

The standard cosmological model informed by cosmic microwave background (CMB) fluctuations 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 2-3σ lower than the expectation from Planck primary CMB anisotropies. Could this be due to new physics? Or could this be due to complexities like feedback from active galaxies? I will show how gravitational lensing of the CMB has and will continue to provide insights into this problem, highlighting recent results from the Atacama Cosmology Telescope and the Simons Observatory.