【摘要】 应用实空间重整化群和累积展开的方法,研究了外场中特殊钻石型等级晶格上S~4模型的相变和临界性质,求出了系统的临界点和临界指数.结果表明,此系统除了存在一个Gauss不动点外,还存在一个Wilson-Fisher不动点,与该等级晶格上的Gauss模型相比较,系统的临界指数发生了变化.更多还原

【Abstract】 Using the renormalization_group transformation and cumulative expansion technique,the phase transition and critical properties of the S4 model on a special diamond_type hierarchical lattice are studied,and its fixed points and critical exponents are obtained. The results show that there exists a Wilson_Fisher fixed point besides the Gaussian fixed point,and compared with the Gaussian model of the special diamond-type hierarchical lattices,the critical exponents have changed.更多还原