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A recent paper [L.-N. Hau and W.-Z. Fu, Phys. Plasmas 14, 110702 (2007)] deals with certain mathematical and physical properties of the kappa distribution. We comment on the authors' use of a form of distribution function that is different from the "standard" form of the kappa distribution, and hence their results, inter alia for an expansion of the distribution function and for the associated number density in an electrostatic potential, do not fully reflect the dependence on kappa that would be associated with the conventional kappa distribution. We note that their definition of the kappa distribution function is also different from a modified distribution based on the notion of nonextensive entropy.
Bibliographical noteThe work of N.S.S. and I.K. was supported by EPSRC-UK Science and Innovation award to the Centre for Plasma Physics (QUB), CPP Grant No. EP/D06337X/1
ASJC Scopus subject areas
- Condensed Matter Physics