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Monte Carlo simulation of a lattice model for the dynamics of randomly branching double-folded ring polymers

Ghobadpour, E ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevE.104.014501
  3. Publisher: American Physical Society , 2021
  4. Abstract:
  5. Supercoiled DNA, crumpled interphase chromosomes, and topologically constrained ring polymers often adopt treelike, double-folded, randomly branching configurations. Here we study an elastic lattice model for tightly double-folded ring polymers, which allows for the spontaneous creation and deletion of side branches coupled to a diffusive mass transport, which is local both in space and on the connectivity graph of the tree. We use Monte Carlo simulations to study systems falling into three different universality classes: ideal double-folded rings without excluded volume interactions, self-avoiding double-folded rings, and double-folded rings in the melt state. The observed static properties are in good agreement with exact results, simulations, and predictions of Flory theory for randomly branching polymers. For example, in the melt state rings adopt compact configurations and exhibit territorial behavior. In particular, we show that the emergent dynamics is in excellent agreement with a recent scaling theory and illustrate the qualitative differences with the familiar reptation dynamics of linear chains. © 2021 American Physical Society
  6. Keywords:
  7. Chromosomes ; Crystal lattices ; Dynamics ; Forestry ; Polymers ; Trees (mathematics) ; Connectivity graph ; Diffusive mass transport ; Excluded-volume interactions ; Qualitative differences ; Scaling theories ; Static properties ; Territorial behaviors ; Universality class ; Monte Carlo methods
  8. Source: Physical Review E ; Volume 104, Issue 1 , 2021 ; 24700045 (ISSN)
  9. URL: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.104.014501