Comment on “Mathematical and physical aspects of Kappa velocity distribution” [Phys. Plasmas 14, 110702 (2007)]
Author(s) -
M. A. Hellberg,
R. L. Mace,
T. K. Baluku,
I. Kourakis,
N. S. Saini
Publication year - 2009
Publication title -
physics of plasmas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.75
H-Index - 160
eISSN - 1089-7674
pISSN - 1070-664X
DOI - 10.1063/1.3213388
Subject(s) - physics , kappa , distribution function , distribution (mathematics) , statistical physics , plasma , entropy (arrow of time) , function (biology) , quantum mechanics , mathematical analysis , mathematics , geometry , evolutionary biology , biology
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 κ 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.
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