Effective metric description of 2+1 dimensional quantum black holes Mattia Damia Paciarini, Stefan Hohenegger, Mikołaj Myszkowski and Francesco Sannino Eur. Phys. J. C, 85 6 (2025) 611 Published online: 04 June 2025 DOI: 10.1140/epjc/s10052-025-14286-8