Physics – Quantum Physics
Scientific paper
2009-07-20
Physics
Quantum Physics
Rewritten Introduction and Abstract in v2 with a slightly altered title to place a sharper focus of our goals and a clearer di
Scientific paper
Recently the Casmir-Polder force felt by an atom near a substrate under nonequilibrium stationary conditions has been studied theoretically with macroscopic quantum electrodyanamics (MQED) and verified experimentally with cold atoms. We give a quantum field theory derivation of the Langevin equation describing the atom's motion based on the influence functional method valid for fully nonequilibrium (nonstationary) conditions. The noise associated with the quantum field derived from first principles is generally colored and nonlocal, which is at variance with the `local source hypothesis' of MQED's generalization to nonequilibrium conditions. Precision measurements on the shape deformation of an atomic gas as a function of its distance from a mirror would provide a direct check of our predictions based on this Langevin equation.
Behunin Ryan Orson
Hu Bei-lok
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