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arXiv 2009.03578hep-th
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大质量费米子的Casimir自由能:各种方法的比较研究

Casimir free energy for massive fermions: a comparative study of various approaches

M. Sasanpour, C. Ajilyan, S. S. Gousheh

摘要:

我们使用三种不同的通用方法计算了具有MIT边界条件的两个平行板之间的大质量费米子场的卡西米尔热力学量,并为每种方法提供了显式解。Casimir热力学量包括Casimir Helmholtz自由能、压强、能量和熵。我们使用的三种一般方法是基于Casimir热力学量的基本定义,由zeta函数方法代表的解析延拓方法,和零温度减法。我们也包括后两种方法的重整化版本,而第一种方法不需要。在每一个一般的方法,我们得到相同的结果,在几个不同的方式来确定所选择的取消的无穷已经做了正确的。然后,我们做一个比较研究的三种不同的一般方法和他们的结果,并表明,他们在原则上是不等价的,他们产生,在一般情况下,不同的结果。特别是,我们表明,仅由第一种方法计算的卡西米尔热力学量具有所有三个属性的温度,场的质量,或板之间的距离增加时,将为零。

英文摘要:

We compute the Casimir thermodynamic quantities for a massive fermion field between two parallel plates with the MIT boundary conditions, using three different general approaches and present explicit solutions for each. The Casimir thermodynamic quantities include the Casimir Helmholtz free energy, pressure, energy and entropy. The three general approaches that we use are based on the fundamental definition of Casimir thermodynamic quantities, the analytic continuation method represented by the zeta function method, and the zero temperature subtraction method. We include the renormalized versions of the latter two approaches as well, whereas the first approach does not require one. Within each general approach, we obtain the same results in a few different ways to ascertain the selected cancellations of infinities have been done correctly. We then do a comparative study of the three different general approaches and their results, and show that they are in principle not equivalent to each other and they yield, in general, different results. In particular, we show that the Casimir thermodynamic quantities calculated only by the first approach have all three properties of going to zero as the temperature, the mass of the field, or the distance between the plates increases.

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