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arXiv 2004.11189cond-mat.stat-mech
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受限三维库仑气体的计算统计力学

Computational Statistical Mechanics of a confined, three-dimensional Coulomb gas

Sergio Davis, Jalaj Jain, Biswajit Bora

摘要:

从理论和计算机模拟的角度来看,具有长程相互作用的系统的热力学性质仍然是一个持续的挑战。在这项工作中,我们研究了一个模型系统,一个库仑气体被限制在一个球体内,通过使用Wang-Landau算法。我们已经计算了组态态密度(CDOS),热力学熵和热量曲线,并与微正则大都市模拟相比,同时显示如何的概念,如组态逆温度可以用来理解热力学行为的某些方面。在微正则蒙特卡罗模拟中,在低能量下可以看到动态多稳态行为,这表明在复杂系统中,平坦直方图方法实际上优于传统模拟。

英文摘要:

The thermodynamic properties of systems with long-range interactions is still an ongoing challenge, both from the point of view of theory as well as computer simulation. In this work we study a model system, a Coulomb gas confined inside a sphere, by using the Wang-Landau algorithm. We have computed the configurational density of states (CDOS), the thermodynamic entropy and the caloric curve, and compared with microcanonical Metropolis simulations, while showing how concepts such as the configurational inverse temperature can be used to understand some aspects of thermodynamic behavior. A dynamical multistability behavior is seen at low energies in microcanonical Monte Carlo simulations, suggesting that flat-histogram methods are in fact superior alternatives to traditional simulation in complex systems.

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