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arXiv math-ph/0509036math-phmath.MPmath.PR
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量子非简谐晶体的Euclidean Gibbs测度

Euclidean Gibbs Measures of Quantum Anharmonic Crystals

Yuri Kozitsky, Tatiana Pasurek

摘要:

考虑了一个相互作用温度环的晶格系统,该晶格系统用于描述一个无限大的相互作用量子粒子系统(量子非谐晶体)的平衡热力学性质。对于这个系统,证明了:(a)Tempered Gibbs测度集是非空的弱紧的;(b)每个Gibbs测度都服从指数可积性估计,对所有这类测度都是一样的;(c)每个Gibbs测度都有Lebowitz-Presutti型支撑;(d)所有Gibbs测度集在高温下是单例的.在吸引相互作用和一维振荡的情况下,我们证明了在低温下系统经历了相变。强量子效应(强扩散性)和非零外场下吉布斯测度的唯一性也得到了证明。因此,一个完整的描述的所有吉布斯措施的集合的属性已经完成,这基本上扩展和细化到目前为止,这种类型的模型所获得的结果。

英文摘要:

A lattice system of interacting temperature loops, which is used in the Euclidean approach to describe equilibrium thermodynamic properties of an infinite system of interacting quantum particles performing anharmonic oscillations (quantum anharmonic crystal), is considered. For this system, it is proven that: (a) the set of tempered Gibbs measures is non-void and weakly compact; (b) every Gibbs measure obeys an exponential integrability estimate, the same for all such measures; (c) every Gibbs measure has a Lebowitz-Presutti type support; (d) the set of all Gibbs measures is a singleton at high temperatures. In the case of attractive interaction and one-dimensional oscillations we prove that at low temperatures the system undergoes a phase transition. The uniqueness of Gibbs measures due to strong quantum effects (strong diffusivity) and at a nonzero external field are also proven in this case. Thereby, a complete description of the properties of the set of all Gibbs measures has been done, which essentially extends and refines the results obtained so far for models of this type.

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