Improved Taylor Expansion method in the Ising model

Details Improved Taylor Expansion method in the Ising model Improved Taylor Expansion method in the Ising model

2005-10-13

arxiv.org/abs/hep-th/0510105v2

Prog.Theor.Phys. 115 (2006) 473-486

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, 9 figures

Scientific paper

10.1143/PTP.115.473

We apply an improved Taylor expansion method, which is a variational scheme to the Ising model in two dimensions. This method enables us to evaluate the free energy and magnetization in strong coupling regions from the weak coupling expansion, even in the case of a phase transition. We determine the approximate value of the transition point using this scheme. In the presence of an external magnetic field, we find both stable and metastable physical states.

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