Title: Maximal fluctuations of confined actomyosin gels: dynamics of the cell nucleus,
Abstract: We investigate the effect of stress fluctuations on the stochastic dynamics
of an inclusion embedded in a viscous gel. We show that, in non-equilibrium
systems, stress fluctuations give rise to an effective attraction towards the
boundaries of the confining domain, which is reminiscent of an active Casimir
effect. We apply this generic result to the dynamics of deformations of the
cell nucleus and we demonstrate the appearance of a fluctuation maximum at a
critical level of activity, in agreement with recent experiments [E. Makhija,
D. S. Jokhun, and G. V. Shivashankar, Proc. Natl. Acad. Sci. U.S.A. 113, E32
(2016)].