Nonlinear modeling of financial state variables and multiscale numerical analysis Zi-Fei Lin, Heng-Heng Zhao and Zimeng Sun Eur. Phys. J. Spec. Top., 234 3 (2025) 691-705 Published online: 29 January 2025 DOI: 10.1140/epjs/s11734-024-01441-7