Detection of early-universe gravitational-wave signatures and fundamental physics - Caldwell, Robert; Cui, Yanou; Guo, Huai-Ke; Mandic, Vuk; Mariotti, Alberto; No, Jose Miguel; Ramsey-Musolf, Michael J; Sakellariadou, Mairi; Sinha, Kuver; Wang, Lian-Tao; White, Graham; Zhao, Yue; et al. (GENERAL RELATIVITY AND GRAVITATION, 2022)