Joule–Thomson expansion and images of black hole in SU(N)-non-linear sigma model Adnan Malik, Shahid Chaudhary and Ahmed Sayed M. Metwally Eur. Phys. J. C, 84 6 (2024) 610 Published online: 17 June 2024 DOI: 10.1140/epjc/s10052-024-12857-9