Gravitational-wave effects in the most general vector–tensor theory Yu-Qi Dong, Xiao-Bin Lai, Yu-Qiang Liu and Yu-Xiao Liu Eur. Phys. J. C, 85 6 (2025) 645 Published online: 11 June 2025 DOI: 10.1140/epjc/s10052-025-14378-5