Schwinger action principle via linear quantum canonical transformations

  • M. Boudjema-Bouloudenine
  • T. BoudjedaaEmail author
  • A. Makhlouf
Theoretical Physics


We have applied the Schwinger action principle to general one-dimensional (1D), time-dependent quadratic systems via linear quantum canonical transformations, which allowed us to simplify the problems to be solved by this method. We show that while using a suitable linear canonical transformation, we can considerably simplify the evaluation of the propagator of the studied system to that for a free particle. The efficiency and exactness of this method is verified in the case of the simple harmonic oscillator. This technique enables us to evaluate easily and immediately the propagator in some particular cases such as the damped harmonic oscillator, the harmonic oscillator with a time-dependent frequency, and the harmonic oscillator with time-dependent mass and frequency, and in this way the propagator of the forced damped harmonic oscillator is easily calculated without any approach.


Field Theory Elementary Particle Quantum Field Theory Harmonic Oscillator Action Principle 
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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • M. Boudjema-Bouloudenine
    • 1
  • T. Boudjedaa
    • 2
    Email author
  • A. Makhlouf
    • 3
  1. 1.Département de Physique, Faculté des SciencesUniversité Badji Mokhtar-AnnabaAnnabaAlgeria
  2. 2.Laboratoire de Physique Théorique, Département de Physique, Faculté des SciencesUniversité de JijelOuled AissaAlgeria
  3. 3.Laboratoire de Mathématiques, Informatique et ApplicationsUniversité de Haute AlsaceMulhouseFrance

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