Quantum Langevin Equations and Stability

Details Quantum Langevin Equations and Stability Quantum Langevin Equations and Stability

1998-01-30

arxiv.org/abs/quant-ph/9801072v1

J.Phys.I(France) 3 (1993) 339-352

Physics

Quantum Physics

12 pages

Scientific paper

Different quantum Langevin equations obtained by coupling a particle to a field are examined. Instabilities or violations of causality affect the motion of a point charge linearly coupled to the electromagnetic field. In contrast, coupling a scatterer with a reflection cut-off to radiation pressure leads to stable and causal motions. The radiative reaction force exerted on a scatterer, and hence its quasistatic mass, depend on the field state. Explicit expressions for a particle scattering a thermal field in a two dimensional space-time are given.

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