Gravitational waves in models with multicritical-point principle Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana, Kin-ya Oda and Kei Yagyu Eur. Phys. J. C, 82 5 (2022) 481 Published online: 25 May 2022 DOI: 10.1140/epjc/s10052-022-10440-8