Boson stars and their frozen states in an infinite tower of higher-derivative gravity Tian-Xiang Ma, Tie-Feng Fang and Yong-Qiang Wang Eur. Phys. J. C, 85 5 (2025) 542 Published online: 15 May 2025 DOI: 10.1140/epjc/s10052-025-14252-4