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arXiv 2004.10067cond-mat.stat-mechhep-ph
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小边界连续介质扩散系统中圆盘覆盖的面积:对弦渗流模型的应用

Area covered by disks in small-bounded continuum percolating systems: An application to the string percolation model

J. E. Ramírez, C. Pajares

摘要:

在弦逾渗模型中,高能碰撞系统的研究是基于二维连续体逾渗理论,其中分布在感兴趣表面上的弦的数量强烈地取决于碰撞粒子的大小和能量。还期望圆盘所在的表面是有限的,从而定义了没有周期性边界条件的系统。在这项工作中,我们报告的修改,由磁盘覆盖的面积在连续介质中的系统,由于有限数量的磁盘和不同的几何形状:圆形,椭圆形,三角形,正方形和五边形,这对应于粒子碰撞后的初始状态的形状波动的第一傅立叶模式的限制。我们发现,由磁盘覆盖的面积的分数从其相应的值在热力学极限的偏差满足一个普遍的行为,其中的自由参数依赖于密度分布,磁盘的数量和边界的形状。因此,它也被发现的颜色抑制因子的字符串渗流模型是由一个阻尼函数有关的小有界效应进行修改。对弦系统中定义的温度和声速的修正也适用于小的椭圆有界系统。

英文摘要:

In string percolation model, the study of colliding systems at high energies is based on a continuum percolation theory in two dimensions where the number of strings distributed in the surface of interest is strongly determined by the size and the energy of the colliding particles. It is also expected that the surface where the disks are lying be finite, defining a system without periodic boundary conditions. In this work, we report modifications to the fraction of the area covered by disks in continuum percolating systems due to a finite number of disks and bounded by different geometries: circle, ellipse, triangle, square and pentagon, which correspond to the first Fourier modes of the shape fluctuation of the initial state after the particle collision. We find that the deviation of the fraction of area covered by disks from its corresponding value in the thermodynamic limit satisfies a universal behavior, where the free parameters depend on the density profile, number of disks and the shape of the boundary. Consequently, it is also found that the color suppression factor of the string percolation model is modified by a damping function related to the small-bounded effects. Corrections to the temperature and the speed of sound defined in string systems are also shown for small and elliptically bounded systems.

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