共查询到17条相似文献,搜索用时 46 毫秒
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采用格点自旋消约方法,将具有最近邻和次近邻耦合作用的镶嵌正方Ising晶格变换成等效的具有最近邻、次近邻和四体耦合作用的正方Ising晶格,得到系统近似解的临界点在K′C=0.4406868.结果表明:在相变点最近邻耦合作用K1和次近邻耦合作用K2之间满足一定关系.如果只计及镶嵌正方Ising晶格的最近邻耦合作用K1,则其严格解的临界点在K1C=0.7635.由此可以推断在正方格点间安放两个自旋的双镶嵌正方Ising晶格,在只计及最近邻耦合作用情况下,也是严格可解的. 相似文献
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运用同伦理论探讨了一类非线性问题的近似解.然后,将其应用于一个燃烧模型,得到了该问题的近似解.
关键词:
非线性方程
同伦
变分迭代法
燃烧模型
近似解 相似文献
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高维时空中Schwarzschild度规和Reissner-Nordstr?m度规的系数g00与g11都满足关系式g00g11=-1。本文考虑这个度规系数的关系式在荷电球体内部成立,而且假设电荷密度σ=σ0rbe-λ(r)/2的情况下,给出高维球对称时空中静态荷电的一个精确内解。 相似文献
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本文对激光束在漫射表面上散射的一类统计模型给出了严格解,并与“质心近似”所得结果作了比较. 相似文献
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An exact solution of the Naive Schwinger model on lattice is found.The continuous limit of the solution is discussed.The result is that the Naive lattice gauge theory can not cut off the unphysical states of the Schwinger model in the high-energy limit. 相似文献
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采用部分格点自旋消约变换,将镶嵌正方晶格上具有最近邻耦合作用K1和次近邻耦合作用K2的Ising模型变换成等效的具有最近邻、次近邻和四体耦合作用的正方Ising晶格.发现系统的临界点在(K1C,K2C)=(0.5125,0.2134),由此决定系统的临界温度,幷讨论了系统的普适性. 相似文献
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We propose a new Potts model, anisotropic bond-dilutedPotts model on square lattice. The interactions along x and y directions in this model are generally unequal and the bond-odcupied probabilities in two directions are also assumed to be different. Such a model is a general Potts model on the square lattice. By establishing the equivalence between anisotropic bond-diluted model and anisotropic regular model and making use of the exact critical relations of regular model, we obtain the critical conditions for anisotropic bond-diluted Potts models with ferromagnetic and antiferromagnetic interactions. Phase diagrams according to these conditions are presented numerically with q=1,2,3,4,5,6 (ferr. case) and q=1,1.5,2,2.5 (antiferr. case) and a discussion about these diagrams is carried out. 相似文献
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FERRIMAGNETIC PHASES OF THE BLUME-EMERY-GRIFFITHS MODEL AND THE POTTS MODEL ON THE DIAMOND LATTICE 下载免费PDF全文
The phase transitions in the Blume-Emery-Griffiths (BEG) model and antiferromagnetic Potts model on the diamond lattice are investigated using the cluster-variation method in the pair approximation. The ferrimagnetic phases are found to be different from those on the simple-cubic lattice. The phase diagrams of the BEG model are also calculated. In the vicinity of the parameter line where the BEG model reduces to the three-state antiferromagnetic Potts model, new types of phase diagram are obtained. The results are different from those of the mean-field theory, which is a good approximation only for large coordination number of the lattice. 相似文献
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ZHENG Bo 《中国物理C(英文版)》1989,13(8):760-764
A modified lattice Schwinger model is proposed and its exact ground state is found. 相似文献
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应用位置空间重整化群方法,对引入“鬼”场的二维次近邻正方格点渗流模型进行研究,得到临界值Pc和临界指数α,β,γ,ν,δ,η。 相似文献