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Manuscript Title: Monte Carlo simulation of lattice Skyrme model.
Authors: R. Saly
Program title: SKY2, SKY3, SKY4
Catalogue identifier: AABZ_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 36(1985)417
Programming language: Fortran.
Computer: VAX 11/780.
Operating system: VAX/VMS.
RAM: 50K words
Word size: 32
Keywords: Particle physics, Elementary, Quantum chromodynamics, Lattice theory, Quantum field theory, Monte carlo methods, Metropolis algorithm, Nonlinear sigma model, Chiral model, Skyrme model, Empirical model.
Classification: 11.5, 11.6.

Nature of problem:
The Skyrme model is an O(4) nonlinear sigma model with an additional stabilizing term. The model serves as large N approximation to quantum chromodynamics. The program simulates thermal equilibrium on a two, three or four dimensional lattice.

Solution method:
A modified Metropolis algorithm is used for a Monte Carlo simulation of the system on a lattice. New configurations are generated site by site and execution of the procedure is accelerated by performing the Metropolis algorithm several times on a given site before proceeding to the next.

Running time:
The program requires about 1/4 (2/3, 1) of a millisecond per spin update in the 2-dimensional (3-, 4-dimensional) case on a VAX 11/780. The test runs need about 1 minute each.