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arXiv 0905.1663hep-thhep-lat
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热场论中的有限体积效应

Finite Volume Effects in Thermal Field Theory

Harvey B. Meyer

摘要:

本文分析了化学势为零时,有限体积对超环面上相对论性量子场论热力学势的影响。利用欧几里得配分函数的对称性,我们将热力学观测量解释为生活在$β\times L^2$体积上的同一理论中的能量-动量张量的期望值。在屏蔽关联长度有限的情况下,我们得到了以最小屏蔽质量表示的主导有限体积效应的封闭公式。这个公式可以用来估计和校正QCD热力学格点计算中的主要有限体积效应。

英文摘要:

We analyze the effect of a finite volume on the thermodynamic potentials of a relativistic quantum field theory defined on a hypertorus at vanishing chemical potential. Using the symmetries of the Euclidean partition function, we interpret the thermodynamic observables as the expectation value of the energy-momentum tensor in the same theory living on a $β\times L^2$ volume. In the case where the screening correlation lengths in the thermal system are finite, we obtain a closed formula for the leading finite volume effects in terms of the smallest screening mass. This formula can be used to estimate, and possibly correct for, the leading finite volume effects in lattice calculations of QCD thermodynamics.

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