Gravitational wave luminosity distance for Starobinsky gravity in viscous cosmological models Jia-nan Chi, Ya-Bo Wu, Yu Sang, Xue Zhang, Yi-liang Hu, Wen-zhong Liu and Bo-hai Chen Eur. Phys. J. C, 85 1 (2025) 22 Published online: 15 January 2025 DOI: 10.1140/epjc/s10052-024-13564-1