The cytoskeleton is an important subsystem of cells that is involved forexample in cell division and locomotion. It consists of filaments that arecross-linked by molecular motors that can induce relative sliding betweenfilaments and generate stresses in the network. In order to study the effectsof fluctuations on the dynamics of such a system we introduce here a new classof driven diffusive systems mimicking the dynamics of active filament bundleswhere the filaments are aligned with respect to a common axis. Afterintroducing the model class we first analyze an exactly solvable case and findcondensation. For the general case we perform a mean-field analysis and studythe behavior on large length scales by coarse-graining. We determine conditionsfor condensation and establish a relation between the hopping rates and thetension generated in the bundle.
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