Multicanonical Chain Growth Algorithm

Details Multicanonical Chain Growth Algorithm Multicanonical Chain Growth Algorithm

2003-04-27

arxiv.org/abs/cond-mat/0304613v1

Phys. Rev. Lett. 91, 208105(1-4) (2003).

Physics

Condensed Matter

Statistical Mechanics

4 pages, RevTeX, 5 Postscript figures, Author Information under http://www.physik.uni-leipzig.de/CQT

Scientific paper

10.1103/PhysRevLett.91.208105

We present a temperature-independent Monte Carlo method for the determination of the density of states of lattice proteins that combines the fast ground-state search strategy of the nPERM chain growth and multicanonical reweighting for sampling the complete energy space. Since the density of states contains all energetic information of a statistical system, we can directly calculate the mean energy, specific heat, Gibbs free energy, and entropy for all temperatures. We apply this method to HP lattice proteins and for the examples of sequences considered, we identify the transitions between native, globule, and random coil states. Since no special properties of heteropolymers are involved in this algorithm, the method applies to polymer models as well.

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