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

Brenna Flaugher, Vivian Miranda, David J. Schlegel, Adam J. Anderson, Felipe Andrade-Oliveira, Eric J. Baxter, Amy N. Bender, Lindsey E. Bleem, Chihway Chang, Clarence C. Chang, Thomas Y. Chen, Kyle S. Dawson, Seth W. Digel, Alex Drlica-Wagner, Simone Ferraro, Alyssa Garcia, Katrin Heitmann, Alex G. Kim, Eric V. Linder, Sayan Mandal, Rachel Mandelbaum, Phil Marshall, Joel Meyers, Laura Newburgh, Peter E. Nugent, Antonella Palmese, M. E. S. Pereira, Neelima Sehgal, Martin White, Yuanyuan Zhang

Published 2022-09-18Version 1

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.