Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 67: Polymer and Molecular Dynamics, Friction and Rheology

CPP 67.4: Vortrag

Freitag, 5. April 2019, 10:30–10:45, H13

Cyclization and relaxation dynamics of finite-length collapsed self-avoiding polymers — •Julian Kappler^1,2, Frank Noé¹, and Roland R. Netz¹ — ¹Freie Universität Berlin, 14195 Berlin, Germany — ²Cambridge University, Cambridge CB3 0WA, United Kingdom

The loop formation kinetics of polymers governs the dynamics of protein folding and gene expression regulation. The quantity of main interest is the cyclization time τ_cyc, i.e. the mean time it takes the two polymer ends to find each other. We study the cyclization and relaxation dynamics of ideal as well as interacting polymers as a function of chain length N. For the cyclization time of ideal chains we recover the known scaling τ_cyc ∼ N², for a self-avoiding slightly collapsed chain we obtain from Langevin simulations and scaling theory a modified scaling τ_cyc ∼ N^5/3. The cyclization and relaxation dynamics of a finite-length collapsed chain scale differently; this unexpected dynamic multi-scale behavior is rationalized by the crossover between swollen and collapsed chain behavior.