Understanding the dynamics of rings in the melt in terms of annealed tree model

Abstract

Dynamical properties of a long polymer ring in a melt of unknotted and unconcatenated rings are calculated. We re-examine and generalize the well known model of a ring confined to a lattice of topological obstacles in the light of the recently developed Flory theory of unentangled rings which maps every ring on an annealed branched polymer and establishes that the backbone associated with each ring follows self-avoiding rather than Gaussian random walk statistics. We find the scaling of ring relaxation time and diffusion coefficient with ring length, as well as time dependence of stress relaxation modulus, zero shear viscosity and mean square averaged displacements of both individual monomers and ring's mass center. Our results agree within error bars with all available experimental and simulations data of the ring melt, although the quality of the data so far is insufficient to make a definitive judgment for or against the annealed tree theory. In the end we review briefly the relation between our findings and experimental data on chromatin dynamics.

arXiv comment12 pages, 8 figures

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Cited by in corpus (13)

• A Topologically Driven Glass in Ring Polymers
• Anomalous diffusion in fractal globules
• Glassiness and Heterogeneous Dynamics in Dense Solutions of Ring Polymers
• Folding and cytoplasm viscoelasticity contribute jointly to chromosome dynamics
• Beyond Flory theory: Distribution functions for interacting lattice trees
• Entanglement length scale separates threading from branching of unknotted and non-concatenated ring polymers in melts
• Persistence Homology Of Entangled Rings
• From statistics of regular tree-like graphs to distribution function and gyration radius of branched polymers
• Fractional Brownian motion meets topology: statistical and topological properties of globular macromolecules with volume interactions
• Configurational entropy of randomly double-folding ring polymers
• Entropic organization of topologically modified ring polymers in spherical confinement
• Coherent modeling of double-folded ring polymers and their underlying random tree structure
• Entropic alignment of topologically modified ring polymers in cylindrical confinement