Koh Shun-ichiro
Physics Division, Faculty of Education, Kochi University, Akebono-cho, 2-5-1, Kochi 780, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jul;72(1 Pt 2):016104. doi: 10.1103/PhysRevE.72.016104. Epub 2005 Jul 5.
Gas-liquid condensation (GLC) in an attractive Bose gas is studied on the basis of statistical mechanics. Using some results in combinatorial mathematics, the following are derived. (1) With decreasing temperature, the Bose-statistical coherence grows in the many-body wave function, which gives rise to the divergence of the grand partition function prior to Bose-Einstein condensation. It is a quantum-mechanical analogue to the GLC in a classical gas (quantum GLC). (2) This GLC is triggered by the bosons with zero momentum. Compared with the classical GLC, an incomparably weaker attractive force creates it. For the system showing the quantum GLC, we discuss a cold helium 4 gas at sufficiently low pressure.
基于统计力学研究了吸引性玻色气体中的气液凝聚（GLC）。利用组合数学中的一些结果，得到了以下内容。（1）随着温度降低，多体波函数中的玻色统计相干性增强，这导致在玻色 - 爱因斯坦凝聚之前巨配分函数发散。它是经典气体中GLC的量子力学类似物（量子GLC）。（2）这种GLC由零动量的玻色子触发。与经典GLC相比，产生它所需的吸引力要弱得多。对于表现出量子GLC的系统，我们讨论了处于足够低压下的冷氦4气体。
