Damping of gravitational waves in f(R) gravity Haiyuan Feng, Laiyuan Su, Rong-Jia Yang and Wei-Qiang Chen Eur. Phys. J. C, 85 3 (2025) 271 Published online: 11 March 2025 DOI: 10.1140/epjc/s10052-025-13940-5