Abstract
We work with a formulation of Noether-symmetry analysis which uses the properties of infinitesimal point transformations in the space-time variables to establish the association between symmetries and conservation laws of a dynamical system. Here symmetries are expressed in the form of generators. We have studied the variational or Noether symmetries of the damped harmonic oscillator representing it by an explicitly time-dependent Lagrangian and found that a five-parameter group of transformations leaves the action integral invariant. Amongst the associated conserved quantities only two are found to be functionally independent. These two conserved quantities determine the solution of the problem and correspond to a two-parameter Abelian subgroup.
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References
E Noether, Invariante Variationsprobleme, Nachr. d. König. Gessellsch. d. Wiss. zu Göttingen, Math-phys. Klasse 235–257 (1918); English translation: M A Travel, Transport Theory and Statistical Physics 1(3), 183–207 (1971)
H Goldstein, Classical mechanics (Narosa Publishing House, New Delhi, India, 1998)
C Lanczos, The variational principles of mechanics, 4th ed. (Dover, New York, 1970)
R M Santilli, Foundations of theoretical mechanics I (Springer-Verlag, New York, 1978)
P Caldirola, Nuovo Cimento 18, 393 (1941) E Kanai, Prog. Theor. Phys. 3, 440 (1948)
G B Arfken and H J Weber, Mathematical method for physicists (Elsevier, New Delhi, India, 2004)
R L Kaushal, Ind. J. Pure Appl. Phys. 43, 479 (2005); Classical and quantum mechanics of noncentral potentials: A survey of two dimensional systems (Narosa, New Delhi/Springer, Heidelberg, 1998)
V K Chandrasekar, M Senthilvelan and M Lakshmanan, J. Math. Phys. 48, 032701 (2007)
R de Ritis, G Marmo, G Plataniao and P Scudellaro, Int. J. Theor. Phys. 22, 931 (1983)
Subrata Ghosh, J Shamanna and B Talukdar, Can. J. Phys. 82, 561 (2004)
P J Olver, Applications of Lie groups to differential equations (Springer-Verlag, New York, 1993)
E L Hill, Rev. Mod. Phys. 23, 253 (1951) J Struckmeier and C Riedel, Phys. Rev. E66, 066605 (2002)
V Tapia, An extended application of the Noether theorem, ICTP preprint number IC/96/161 (1996)
M Lutzky, J. Phys. A11, 249 (1978)
N A Lemos, Am. J. Phys. 47, 857 (1979)
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Choudhuri, A., Ghosh, S. & Talukdar, B. Symmetries and conservation laws of the damped harmonic oscillator. Pramana - J Phys 70, 657–667 (2008). https://doi.org/10.1007/s12043-008-0027-y
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DOI: https://doi.org/10.1007/s12043-008-0027-y
Keywords
- Damped harmonic oscillator
- explicitly time-dependent Lagrangian representation
- Noether symmetries
- conservation laws