Snowmass 2021 CMB-S4 White Paper
  This Snowmass 2021 White Paper describes the Cosmic Microwave Background
Stage 4 project CMB-S4, which is designed to cross critical thresholds in our
understanding of the origin and evolution of the Universe, from the highest
energies at the dawn of time through the growth of structure to the present
day. We provide an overview of the science case, the technical design, and
project plan.
