TY - RPRT TI - What can solve the strong CP problem? AU - Kaplan, David E. [Johns Hopkins Univ., Baltimore, MD (United States); Univ. of Tokyo (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI)] (ORCID:0000000181754506) AU - Melia, Tom [Univ. of Tokyo (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI)] (ORCID:0000000186696958) AU - Rajendran, Surjeet [Johns Hopkins Univ., Baltimore, MD (United States)] (ORCID:0000000199153573) PY - 2025 DO - 10.1007/jhep08(2025)050 UR - https://www.osti.gov/biblio/2569961 ID - 2569961 ER -