Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-07-26
Physics
Condensed Matter
Statistical Mechanics
enlarged version, Revtex, 27 pages, and 10 EPS figures
Scientific paper
For the generalized statistical mechanics based on the Tsallis entropy, a variational perturbation approximation method with the principle of minimal sensitivity is developed by calculating the generalized free energy up to the third order in variational perturbation expansion. The approximation up to the first order amounts to a variational approach which covers the variational method developed in Phys. Rev. Lett. 80, 218 (1998) by Lenzi $et al$, and the approximations up to higher orders can systematically improve variational result. As an illustrated example, the generalized free energy for a classical harmonic oscillator (considered in the Lenzi's joint work) are calculated up to the third order, and the resultant approximations up to the first, second, and third orders are numerically compared with the exact result.
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