N>4时二维Z(N)矢量模型中的相变
The phase transitions in 2D Z(N) vector models for N>4
摘要:
本文对二维Z(N)矢量模型中的重整化群方程进行了解析和数值研究。确定了N>4时两个相变临界点的位置,并计算了临界指数ν。对于N=7,17,通过蒙特卡罗模拟确定了临界点的位置,并确定了相应的临界指数。研究了N= 5,7,17时螺旋度模量的行为。使用这些和其他可用的Monte Carlo数据,我们讨论的标度的临界点与N和其他一些开放的理论问题。
英文摘要:
We investigate both analytically and numerically the renormalization group equations in 2D Z(N) vector models. The position of the critical points of the two phase transitions for N>4 is established and the critical index ν is computed. For N=7, 17 the critical points are located by Monte Carlo simulations and some of the corresponding critical indices are determined. The behavior of the helicity modulus is studied for N=5, 7, 17. Using these and other available Monte Carlo data we discuss the scaling of the critical points with N and some other open theoretical problems.
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