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arXiv 1202.0638cond-mat.stat-mech
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Tsallis统计量中的能量分布和能量涨落

Energy distribution and energy fluctuation in Tsallis statistics

Ran Guo, Jiulin Du

摘要:

用OLM方法研究了Tsallis正则系综的能量分布和能量涨落。所得的能量涨落公式与前人的工作[Liu L.Y.和杜J.L. Physica A 387(2008)5417]。在讨论理想气体的应用时,我们发现在热力学极限下,能量涨落是不可忽略的,这表明在Tsallis统计中,这种情况是系综不等价的。我们研究了Plastino和Plastino [Phys. Lett. A 193(1994)140],用于描述与有限卫生浴接触的系统。在这种情况下,能量涨落的两个公式是等价的,而非广延参数q起着非常重要的作用。

英文摘要:

The energy distribution and the energy fluctuation in the Tsallis canonical ensemble are studied with the OLM formalism but following a new way. The resulting formula for the energy fluctuation is not the same as that in previous work [Liu L.Y. and Du J.L., Physica A 387(2008)5417]. In discussing the application of an ideal gas, we find that the energy fluctuation can not be negligible in the thermodynamic limit, showing the ensemble nonequivalence for this case in Tsallis statistics. We investigate the energy fluctuation with a Tsallis generalized canonical distribution studied by Plastino and Plastino [Phys. Lett. A 193(1994)140] for describing a system in contact with a finite heath bath. For this situation, the two formulae for the energy fluctuation are shown to be equivalent, while the nonextensive parameter q plays a very important role.

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