STRONG-COUPLING PERTURBATION THEORY IN A SIMPLE AND EXACTLY SOLVABLE MODEL

DOI: 10.18173/2354-1059.2025-0005

Abstract

We study strong-coupling perturbation theory in a simple and exactly solvable model. The divergence of the perturbative series is effectively addressed using the technique of continued fractions. The results obtained from perturbation theory show good agreement with the exact solutions. The calculations are straightforward, making them suitable for teaching quantum mechanics or other theoretical physics courses, as well as for application in more complex research studies