• Kamlesh Kumari

      Articles written in Pramana – Journal of Physics

    • A new formalism for the statistical dynamics of planar spin systems

      Kamlesh Kumari Deepak Kumar

      More Details Abstract Fulltext PDF

      The relaxational dynamics of a classical planar Heisenberg spin system is studied using the Fokker-Planck equation. A new approach is introduced in which we attempt to directly calculate the eigenvalues of the Fokker-Planck operator. In this connection a number space representation is introduced, which enables us to visualize the eigenvalue structure of the Fokker-Planck operator. The mean field approximation is derived and a systematic method to improve the mean field approximation is presented.

    • A new formalism for the statistical dynamics of vector spin systems

      Kamlesh Kumari Deepak Kumar

      More Details Abstract Fulltext PDF

      The relaxational dynamics of a classical vector Heisenberg spin system is studied using the Fokker-Planck equation. To calculate the eigenvalues of the Fokker-Planck operator, a new approach is introduced. In this connection, a number space repesentation is introduced, which enables us to visualize the eigenvalue structure of the Fokker-Planck operator. The mean field approximation is derived and a systematic method to improve the mean field approximation is presented.

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