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A modification of a classical method to obtain Floquet exponents and solutions for linear periodic differential equations.
  • Manuel Gadella,
  • Luis Pedro Lara
Manuel Gadella
Universidad de Valladolid
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Luis Pedro Lara
Instituto de Fisica Rosario
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We propose a modification of a method based on Fourier analysis to obtain the Floquet characteristic exponents for periodic homogeneous linear systems, which shows a high precision. This modification uses a variational principle to find the correct Floquet exponents among the solutions of an algebraic equation. Once we have these Floquet exponents, we determine explicit approximated solutions. We test our results on systems for which exact solutions are known to verify the accuracy of our method including one dimensional periodic potentials of interest in quantum physics. Using the equivalent linear system, we also study approximate solutions for homogeneous linear equations with periodic coefficients.