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arXiv 0903.0260cond-mat.quant-gascond-mat.other
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相互作用玻色气体的非微扰热力学

Nonperturbative thermodynamics of an interacting Bose gas

S. Floerchinger, C. Wetterich

摘要:

本文讨论具有局域排斥作用的非相对论玻色子气体的热力学。特别是,我们计算的压力,能量和熵密度,超流和冷凝分数,相关长度,比热,等温和绝热压缩性和各种声速的温度和密度的依赖性。T->0极限接近量子相变,而O(2)普适类中经典二级相变的普适临界行为决定了临界温度附近的区域。我们的非微扰流方程的基础上精确的功能重整化覆盖所有区域的相图。

英文摘要:

We discuss the thermodynamics of a non-relativistic gas of bosons with a local repulsive interaction. In particular, we compute the temperature and density dependence of pressure, energy and entropy-density, superfluid and condensate-fraction, correlation length, specific heat, isothermal and adiabatic compressibility and various sound velocities. The T->0 limit approaches the quantum phase transition, while the universal critical behavior of a classical second order phase transition in the O(2) universality class determines the region around the critical temperature. Our non-perturbative flow equations based on exact functional renormalization cover all regions in the phase diagram.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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