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The expected increase in sensitivity for CMB-S4
CMB-S4 Science Book, First Edition (arXiv:1610.02743)
Schematic timeline showing the expected increase in sensitivity (μK2) and the corresponding improvement for a few of the key cosmological parameters for Stage-3, along with the threshold-crossing aspirational goals targeted.
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Current status of CMB-S4CMB-S4: Next Generation CMB Experiment

The 'Stage-4' ground-based cosmic microwave background (CMB) experiment, CMB-S4, consisting of dedicated telescopes equipped with highly sensitive superconducting cameras operating at the South Pole, the high Chilean Atacama plateau, and possibly northern hemisphere sites, will provide a dramatic leap forward in our understanding of the fundamental nature of space and time and the evolution of the Universe. CMB-S4 will be designed to cross critical thresholds in testing inflation, determining the number and masses of the neutrinos, constraining possible new light relic particles, providing precise constraints on the nature of dark energy, and testing general relativity on large scales.

Current & Upcoming Events
Mar 30 - Apr 2, 2020LBNL-2020: CMB-S4 Collaboration Workshop at LBNL, Berkeley, CA

Latest News
Feb 27, 2020LBNL-2020: CMB-S4 Collaboration Workshop at LBNL, Berkeley, CA
Jul 28, 2019CMB-S4 APC White Paper Submitted to Decadal Survey on July 10, 2019
Jul 28, 2019CMB-S4 Achieves DOE Critical Design 0 on July 26, 2019
Jul 28, 2019UCSD 2019: CMB-S4 Collaboration Workshop at U.C. San Diego October 17-19, 2019
Jul 28, 2019CMB-S4 Science Case, Reference Design and Project Plan posted