M. Bordag, V. Demchik, A. Gulov, V. Skalozub
The temperature induced phase transition is investigated in the one-component scalar field \phi^4 model on the lattice. Using the GPU cluster a huge amount of Monte Carlo simulation data is collected for a wide interval of coupling values. This gives a possibility to determine the low bound on the coupling constant \lambda_0 when the transition happens and investigate its type. We found that for the values of \lambda close to this bound a weak-first-order phase transition takes place. It converts into a second order one with the increase of \lambda. A comparison with the results obtained in analytic and numeric calculations by other authors is given.
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http://arxiv.org/abs/1204.0651
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