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Manuscript Title: High temperature expansion via Schwinger-Dyson equations: the planar
rotator model on a triangular lattice. | ||

Authors: P. Butera, R. Cabassi, M. Comi, G. Marchesini | ||

Program title: KAPPA,KP | ||

Catalogue identifier: AATS_v1_0Distribution format: gz | ||

Journal reference: Comput. Phys. Commun. 44(1987)143 | ||

Programming language: Fortran. | ||

Computer: VAX8600. | ||

Operating system: VMS (VERSION 4.2). | ||

RAM: 24K words | ||

Word size: 32 | ||

Peripherals: disc. | ||

Keywords: High temperature expansion, Planar rotator model, Lattice spin models, Classical O(2) Heisenberg model, Schwinger-dyson equation, Kosterlitz-thouless phase transition. | ||

Classification: 7.8, 23. | ||

Nature of problem:We describe a Fortran program implementing a new algorithm to compute high temperature expansions for lattice spin models. The case of the planar rotator model on a triangular lattice is illustrated here in detail. | ||

Solution method:The method relies on the iterative solution of the Schwinger Dyson equations of the model. | ||

Running time:The test run for the high temperature expansion up to the order 9 took 18 s for computing the K matrix (program KAPPA) and 6 s for each correlation moment (program KP). |

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