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arXiv 1409.7340math-phcond-mat.stat-mechmath.MPmath.SG
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接触对称性与哈密顿热力学

Contact Symmetries and Hamiltonian Thermodynamics

A. Bravetti, C. S. Lopez-Monsalvo, F. Nettel

摘要:

它已被证明,接触几何是适当的框架下的经典热力学和热力学的波动被捕获的一个额外的度量结构相关的费舍尔的信息矩阵。在这项工作中,我们分析了几个未解决的方面的应用接触和度量几何热力学。我们认为在这里的热力学相空间,并开始调查的规范变换和勒让德对称性的作用,度量接触流形及其在热力学中的意义。然后,我们提出了一个新的数学表征的一级相变平衡过程的热力学相空间的勒让德对称性被打破。此外,我们使用接触哈密顿动力学来表示热力学过程的方式,类似于经典的哈密顿制定的保守力学,我们表明,相关的哈密顿符合沿热力学过程的不可逆熵产生。因此,我们根据热力学第二定律,利用这一性质给出了可容涨落的几何定义。最后,我们表明,描述一个热力学过程的曲线的长度测量其熵产生。

英文摘要:

It has been shown that contact geometry is the proper framework underlying classical thermodynamics and that thermodynamic fluctuations are captured by an additional metric structure related to Fisher's Information Matrix. In this work we analyze several unaddressed aspects about the application of contact and metric geometry to thermodynamics. We consider here the Thermodynamic Phase Space and start by investigating the role of gauge transformations and Legendre symmetries for metric contact manifolds and their significance in thermodynamics. Then we present a novel mathematical characterization of first order phase transitions as equilibrium processes on the Thermodynamic Phase Space for which the Legendre symmetry is broken. Moreover, we use contact Hamiltonian dynamics to represent thermodynamic processes in a way that resembles the classical Hamiltonian formulation of conservative mechanics and we show that the relevant Hamiltonian coincides with the irreversible entropy production along thermodynamic processes. Therefore, we use such property to give a geometric definition of thermodynamically admissible fluctuations according to the Second Law of thermodynamics. Finally, we show that the length of a curve describing a thermodynamic process measures its entropy production.

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