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Physics Colloquium: "Cosmic consistency tested over 12 billion years" with Dr. Mat Madhavacheril (University of Pennslvania)

December 9, 2024
12:30 PM - 1:30 PM
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Theory Center, Pupin Hall 8th Floor

Research Overview: https://live-sas-physics.pantheon.sas.upenn.edu/people/mathew-madhavacheril

"Cosmic consistency tested over 12 billion years"

The standard ΛCDM 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 2-3σ 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.