Report of the Topical Group on Cosmic Frontier 5 Dark Energy and Cosmic Acceleration: Cosmic Dawn and Before for Snowmass 2021

Kavli Affiliate: Clarence L. Chang

| First 5 Authors: Clarence L. Chang, Laura Newburgh, Deirdre Shoemaker, Stefan W. Ballmer, Daniel Green

| Summary:

This report summarizes the envisioned research activities as gathered from
the Snowmass 2021 CF5 working group concerning Dark Energy and Cosmic
Acceleration: Cosmic Dawn and Before. The scientific goals are to study
inflation and to search for new physics through precision measurements of relic
radiation from the early universe. The envisioned research activities for this
decade (2025-35) are constructing and operating major facilities and developing
critical enabling capabilities. The major facilities for this decade are the
CMB-S4 project, a new Stage-V spectroscopic survey facility, and existing
gravitational wave observatories. Enabling capabilities include aligning and
investing in theory, computation and model building, and investing in new
technologies needed for early universe studies in the following decade (2035+).

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