2009/06/30 by Hideo Hasegawa · 8 citations
Economics, Econometrics and Finance · Mathematics · Physics and Astronomy · #Artificial intelligence #Complex Systems and Time Series Analysis #Computer science #Interpolation (computer graphics) #Mathematics #Physics #Quantum Mechanics and Applications #Statistical Mechanics and Entropy #Statistical physics #Statistics #cond-mat.mtrl-sci #cond-mat.stat-mech
paper · pdf · doi:10.1016/j.physa.2010.02.009
published in Physica A Statistical Mechanics and its Applications 389(12), 2358-2375 (Elsevier BV) · 23 pages, 16 figures: augmented the text with changed title
arxiv created 2009/07/01 · openalex publication_date 2010/02/15 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Recently it has been shown by the present author [H. Hasegawa, Phys. Rev. E (in press): arXiv:0904.2399] that the interpolation approximation (IA) to the generalized Bose-Einstein and Femi-Dirac distributions yields results in agreement with the exact ones within the O(q-1) and in high- and low-temperature limits, where (q-1) expresses the non-extensivity: the case of q=1 corresponding to the conventional quantal distributions. In this study, we have applied the generalized distributions in the IA to typical nonextensive subjects: (1) the black-body radiation, (2) the Bose-Einstein condensation, (3) the BCS superconductivity and (4) itinerant-electron (metallic) ferromagnetism. Effects of the non-extensivity on physical quantities in these nonextenisive quantum systems have been investigated. A critical comparison is made between results calculated by the IA and the factorization approximation (FA) which has been so far applied to many nonextensive systems. It has been pointed out that the FA overestimates the non-extensivity and that it leads to an inappropriate results for fermion systems like the subjects (3) and (4).