Phonon motion around (2+1)-dimensional acoustic black hole Bobir Toshmatov, Bobomurat Ahmedov and Zdeněk Stuchlík Eur. Phys. J. C, 83 10 (2023) 981 Published online: 31 October 2023 DOI: 10.1140/epjc/s10052-023-12181-8