Regensburg 2025 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 22: Poster: Statistical Physics

DY 22.13: Poster

Wednesday, March 19, 2025, 10:00–12:00, P3

Dielectric response and fluctuation-dissipation-theorem for moving bodies — •Daniele Gamba, Philip Rauch, and Matthias Krüger — Georg-August University, Göttingen

Casimir forces operate at microscopic scales and are integral to phenomena such as gecko adhesion and functionality of nano-devices. Recent research has unveiled new effects, arising from thermal and mechanical non-equilibrium, such as levitation or propulsive forces capable to driving heat engines, or novel effects tied to optically non-reciprocal materials [1,2]. In this contribution we formulate scattering theory for objects in respective motion. Specifically, we find the dielectric response and the fluctuation-dissipation theorem for arbitrary moving bodies. The dielectric response of a moving body is found to be nonlocal in space, optically non-reciprocal, and can also appear as being active. Conversely, it is possible to design an active medium that appears optically passive when in motion. Finally, we derive closed expressions for Casimir forces and heat transfer between moving bodies using scattering theory.
1. Krüger et al., Physical Review B, 2012.
2. Gelbwaser-Klimovsky et al., Physical Review Letters, 2021.

Keywords: Casimir; Nonequilibrium; Electrodynamics; Fluctuation-dissipation; Dielectric