Topological interactions in systems of mutually interlinked polymer rings

Details Topological interactions in systems of mutually interlinked polymer rings Topological interactions in systems of mutually interlinked polymer rings

2003-09-08

arxiv.org/abs/cond-mat/0309184v1

Physics

Condensed Matter

Statistical Mechanics

16 pages, 3 figure

Scientific paper

10.1088/0305-4470/37/8/003

The topological interaction arising in interlinked polymeric rings such as DNA catenanes is considered. More specifically, the free energy for a pair of linked random walk rings is derived where the distance $R$ between two segments each of which is part of a different ring is kept constant. The topology conservation is imposed by the Gauss invariant. A previous approach (M.Otto, T.A. Vilgis, Phys.Rev.Lett. {\bf 80}, 881 (1998)) to the problem is refined in several ways. It is confirmed, that asymptotically, i.e. for large $R\gg R_G$ where $R_G$ is average size of single random walk ring, the effective topological interaction (free energy) scales $\propto R^4$.

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