P Rudra
Articles written in Pramana – Journal of Physics
Volume 23 Issue 4 October 1984 pp 445-457 Mathematical Physics
Symmetry groups of mathematical physics
Recent work on Lie’s method of extended groups to obtain symmetry groups and invariants of differential equations of mathematical physics is surveyed. As an essentially new contribution one-parameter Lie groups admitted by three-dimensional harmonic oscillator, three-dimensional wave equation, Klein-Gordon equation, two-component Weyl’s equation for neutrino and four-component Dirac equation for Fermions are obtained.
Volume 26 Issue 5 May 1986 pp 409-417 Nuclear Physics
Stochastic model of nuclear levelwidth
We investigate here the origin of nuclear levelwidth as an effect of the coupling of particle mode and the surface vibration mode of the nucleus. This interaction is taken to be stochastic in nature, characterized by a single correlation time
Volume 26 Issue 6 June 1986 pp 481-487
Lie’s method of differential equation is used to obtain the one-parameter Lie groups admitted by the time-dependent Schrödinger equations for atoms, molecules and nucleons in harmonic oscillator field. This group for atoms and molecules is isomorphic to 10-parameter inhomogeneous orthogonal group in 4 dimensions, irrespective of the numbers of nuclei and electrons. For Z protons and
Volume 53 Issue 5 November 1999 pp 795-806 Research Articles
Group of contact transformations: Symmetry classification of Fokker-Planck type equations
Fokker-Planck type equations have been classified according to the groups of contact transformations to which they belong. It has been found that there are only five classes as in the case of groups of point transformations. We have also obtained the algebraic structures of the corresponding Lie algebras. However, there are isomorphies in their group properties. The corresponding basis sets of functionally independent invariants formed by the generators of these groups have also been obtained.
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