# Dresden 2006 – wissenschaftliches Programm

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# CPP: Chemische Physik und Polymerphysik

## CPP 10: POSTER Nonequilibrium Phenomena in Soft Condensed Matter

### CPP 10.5: Poster

### Dienstag, 28. März 2006, 17:00–19:00, P3

**Mediated Forces in out of Equilibrium Systems** — •Ali Najafi — Max-Planck Institut for Physics of Complex Systeme, Nothnitze str. 38, 01187 Dresden, Germany

We study the fluctuation-induced forces in systems with non-equilibrium nature. we show that in a system with nonuniform temperature profile a net force is exerted on a single flat plate that restricts the scale-free fluctuations of a scalar medium. This force resembles the thermophoresis or the Soret effect. Another class of non-equilibrium systems corresponds to the case where a topological defect moves in a phononic background. We show that inertial coupling between A single defect and ambient phonons leads to variety of interesting phenomena. Similar to the problem of dynamical Casimir effect the energy dissipation and mass renormalization of A moving defects are the results of this mediated interactions. Phonon-mediated coupling between many defects also investigated. We show that a regular lattice of such interacting defects will have anisotropic and anomalous mass and elastic constants.