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We study dynamically crowded solutions of stiff fibers deep in the semidiluteregime, where the motion of a single constituent becomes increasingly confinedto a narrow tube. The spatiotemporal dynamics for wave numbers resolving themotion in the confining tube becomes accessible in Brownian dynamicssimulations upon employing a geometry-adapted neighbor list. We demonstratethat in such crowded environments the intermediate scattering function,characterizing the motion in space and time, can be predicted quantitatively bysimulating a single freely diffusing phantom needle only, yet with very unusualdiffusion coefficients.

Tube Concept for Entangled Stiff Fibers Predicts Their Dynamics in Space and Time