2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/219855Performing a relativistic approximation as the generalization to a curved spacetime of the flat space Klein-Gordon equation, an effective Hamiltonian which includes non-minimial coupling between gravity and scalar field and also quartic self-interaction of scalar field term is obtained.4 pagesGeneral Relativity and Quantum Cosmologytext