Dresden 2006 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.75: Poster

Donnerstag, 30. März 2006, 16:00–18:00, P1

Application of new chain growth algorithms for lattice polymers — •Thomas Vogel, Michael Bachmann, and Wolfhard Janke — Institut für Theoretische Physik, Universität Leipzig, Augustusplatz 10/11, 04109 Leipzig

We apply recently developed enhancements of the Pruned Enriched Rosenbluth Method (PERM) [1], namely the Multicanonical Chain-Growth Algorithm [2] and the Flat Histogram Method [3], to polymers and peptides on lattices.

The multicanonical version is based on the idea to sample temperature-independently the complete energy space of polymer conformations. It enables, for example, the determination of the density of states within one simulation run for hydrophobic-polar (HP) proteins.

The flat histogram version follows a similar strategy from a microcanonical view of the problem and was used so far for studies of long interacting self-avoiding walks (ISAWs).

We apply both algorithms to interacting self-avoiding walks as well as to HP proteins to compare the behaviour of the two versions and, of course, to get new results for statistical properties of polymers and peptides.

[1] P. Grassberger, Phys. Rev. E 56 (1997) 3682.

[2] M. Bachmann and W. Janke, Phys. Rev. Lett. 91 (2003) 208105.

[3] T. Prellberg and J. Krawczyk, Phys. Rev. Lett. 92 (2004) 120602.