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The truncated Levy-flight process: Application to the random spin phase change in non-linear magnetic fields

Author

Listed:
  • Posnansky, Oleg
  • Huang, Ruiwang
  • Jon Shah, N.

Abstract

In NMR experiments, self-diffusion of water molecules leads to a random spin phase distribution which is Gaussian in linear magnetic fields. The rate of convergence of the random phase distribution to the Gaussian distribution is very slow. Moreover, a small departure from linear magnetic fields results in significant changes in the spin phase distribution, especially in the central part, and the distribution can be described by Levy-flight process. However, the far-tails of the Levy-like distribution conserve information about the Gaussian prehistory and can validate the degree of non-linearity of the magnetic field. In this paper, the rate, α, of convergence to the Gaussian distribution is calculated for the case of the variation of the power of non-linearity of the magnetic field p and it is shown that α(p)∈(0,0.66] when p∈[1,∞).

Suggested Citation

  • Posnansky, Oleg & Huang, Ruiwang & Jon Shah, N., 2006. "The truncated Levy-flight process: Application to the random spin phase change in non-linear magnetic fields," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 370(2), pages 553-564.
  • Handle: RePEc:eee:phsmap:v:370:y:2006:i:2:p:553-564
    DOI: 10.1016/j.physa.2006.03.062
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