Report of the Topical Group on Dark Energy and Cosmic Acceleration: Complementarity of Probes and New Facilities for Snowmass 2021

Kavli Affiliate: Lindsey E. Bleem

| First 5 Authors: Brenna Flaugher, Vivian Miranda, David J. Schlegel, Adam J. Anderson, Felipe Andrade-Oliveira

| Summary:

The mechanism(s) driving the early- and late-time accelerated expansion of
the Universe represent one of the most compelling mysteries in fundamental
physics today. The path to understanding the causes of early- and late-time
acceleration depends on fully leveraging ongoing surveys, developing and
demonstrating new technologies, and constructing and operating new instruments.
This report presents a multi-faceted vision for the cosmic survey program in
the 2030s and beyond that derives from these considerations. Cosmic surveys
address a wide range of fundamental physics questions, and are thus a unique
and powerful component of the HEP experimental portfolio.

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