Listar por tema "Exponential perturbation theory"

Mostrando ítems 1-2 de 2

    • openAccess   A pedagogical approach to the Magnus expansion 

      Blanes, Sergio; Casas, Fernando; Oteo, J. A.; Ros, J. Institute of Physics (2010-07)
      Time-dependent perturbation theory as a tool to compute approximate solutions of the Schrödinger equation does not preserve unitarity. Here we present, in a simple way, how the Magnus expansion (also known as exponential ...

    • openAccess   New anallytic approximations based on the Magnus expansion 

      Sánchez, S.; Casas, Fernando; Fernández, A. Springer Science+Business Media, LLC (2011-09)
      The Magnus expansion is a frequently used tool to get approximate analytic solutions of time-dependent linear ordinary differential equations and in particular the Schrödinger equation in quantum mechanics. However, the ...