Berlin 2012 – scientific programme
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BP: Fachverband Biologische Physik
BP 27: Posters: Cytoskeletal Filaments
BP 27.6: Poster
Thursday, March 29, 2012, 17:30–19:30, Poster A
Dynamics of semiflexible ring polymers in shear fow — •Philipp Lang and Erwin Frey — Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München
The dynamics of semiflexible ring polymers is studied both in equilibrium and subject to external shear flow. We give a comprehensive analytical description of the relaxational dynamics of internal and global modes in the case of persistence lengths greater or equal than the contour lengths. A relaxation behavior similar to linear polymers is found, yet crossover times and amplitudes are different due to smaller internal fluctuations.
The non-equilibrium dynamics in shear flow is investigated by Brownian dynamics simulations of inextensible rings and interpreted in terms of the relaxational dynamics. We find two distinct types of tumbling events: rapid turnover, and tread-milling in a metastable state. The main tumbling frequency is found to scale with the Weissenberg number Wi = κ · τL as Wi3/4 with the time scale τL given by the global rotational relaxation time.