A non-perturbative method for time-dependent problems in quantum mechanics

Abstract

A powerful method for calculating the eigenvalues of a Hamiltonian operator consists of converting the energy eigenvalue equation into a matrix equation by means of an appropriate basis set of functions. The convergence of the method can be greatly improved by means of a variational parameter in the basis functions determined by the principle of minimal sensitivity. In the case of the quartic anharmonic oscillator and of a symmetrical double-well potential we choose an effective oscillator frequency. In the case of nonsymmetrical potential we add a coordinate shift in a two-parameter variational calculation. The method not only gives the spectrum, but also an approximation to the energy eigenfunctions. Consequently it can be used to solve the time-dependent Schrödinger equation using the method of stationary states. We apply it to the time development of two different initial wave functions in the double-well slow roll potential.

14 pages, 8 figures

References in corpus (5)

• Exact and approximate expressions for the period of anharmonic oscillators
• Systematic perturbation calculation of integrals with applications to physics
• Quantum Dynamics of the Slow Rollover Transition in the Linear Delta Expansion
• The spectrum of a quantum potential
• Convergence acceleration of series through a variational approach