Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-01-17
Physics
Condensed Matter
Statistical Mechanics
11 pages, 7 figures
Scientific paper
10.1088/1742-5468/2007/06/P06004
Thermodynamical properties of the helix-coil transition were successfully described in the past by the model of Lifson, Poland and Sheraga. Here we compute the corresponding structure factor and show that it possesses a universal scaling behavior near the transition point, even when the transition is of first order. Moreover, we introduce a dynamical version of this model, that we solve numerically. A Langevin equation is also proposed to describe the dynamics of the density of hydrogen bonds. Analytical solution of this equation shows dynamical scaling near the critical temperature and predicts a gelation phenomenon above the critical temperature. In the case when comparison of the two dynamical approaches is possible, the predictions of our phenomenological theory agree with the results of the Monte Carlo simulations.
Kunz Herve
Livi Roberto
Suto Andras
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