TY - RPRT TI - Universal CMB 𝐵-mode spectrum from early causal tensor sources AU - Greene, Kylar [Seoul National Univ. (Korea, Republic of)] (ORCID:0000000227117191) AU - Ireland, Aurora [Stanford Univ., CA (United States)] (ORCID:0000000153930971) AU - Krnjaic, Gordan [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); University of Chicago, IL (United States)] (ORCID:0000000174209577) AU - Tsai, Yuhsin [University of Notre Dame, IN (United States)] (ORCID:000000017847225X) PY - 2026 DO - 10.1103/vzpt-4wqc UR - https://www.osti.gov/biblio/3016035 ID - 3016035 ER -