Continuum model for polymers with finite thickness

Details Continuum model for polymers with finite thickness Continuum model for polymers with finite thickness

2005-03-24

arxiv.org/abs/cond-mat/0503596v1

Physics

Condensed Matter

Statistical Mechanics

8 pages, 4 figures. Accepted for publication in J. Phys. A

Scientific paper

10.1088/0305-4470/38/17/L01

We consider the continuum limit of a recently-introduced model for discretized thick polymers, or tubes. We address both analytically and numerically how the polymer thickness influences the decay of tangent-tangent correlations and find how the persistence length scales with the thickness and the torsional rigidity of the tube centerline. At variance with the worm-like chain model, the phase diagram that we obtain for a continuous tube is richer; in particular, for a given polymer thickness there exists a threshold value for the centerline torsional rigidity separating a simple exponential decay of the tangent-tangent correlation from an oscillatory one.

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