Quasinormal modes in two-photon autocorrelation and the geometric-optics approximationWei-Liang Qian, Kai Lin, Xiao-Mei Kuang, Bin Wang and Rui-Hong YueEur. Phys. J. C, 82 3 (2022) 188DOI: https://doi.org/10.1140/epjc/s10052-022-10155-w