Model of black hole and white hole in Minkowski spacetime Chen Yu-Zhu, Chen Yu-Jie, Li Shi-Lin, Zhang Fu-Lin and Dai Wu-Sheng Eur. Phys. J. C, 81 12 (2021) 1107 Published online: 15 December 2021 DOI: 10.1140/epjc/s10052-021-09901-3