2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/208100The Casimir interaction between two perfectly conducting, infinite, concentric cylinders is computed using a semiclassical approximation that takes into account families of classical periodic orbits that reflect off both cylinders. It is then compared with the exact result obtained by the mode-by-mode summation technique. We analyze the validity of the semiclassical approximation and show that it improves the results obtained through the proximity theorem.28 pages, 5 figures includedQuantum PhysicsHigh Energy Physics - Theorytext