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  • Title: Gyration radius of a circular polymer under a topological constraint with excluded volume.
    Author: Shimamura MK, Deguchi T.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2001 Aug; 64(2 Pt 1):020801. PubMed ID: 11497553.
    Abstract:
    It is nontrivial whether the average size of a ring polymer should become smaller or larger under a topological constraint. Making use of some knot invariants, we numerically evaluate the mean-square radius of gyration for ring polymers having a fixed knot type, where the ring polymers are given by self-avoiding polygons consisting of freely jointed hard cylinders. We obtain plots of the gyration radius versus the number of polygonal nodes for the trivial, trefoil, and figure-eight knots. We discuss possible asymptotic behaviors of the gyration radius under the topological constraint. In the asymptotic limit, the size of a ring polymer with a given knot is larger than that of no topological constraint when the polymer is thin, and the effective expansion becomes weak when the polymer is thick enough.
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