Volume 82, Number 5, June 2008
|Number of page(s)||6|
|Section||Atomic, Molecular and Optical Physics|
|Published online||28 May 2008|
Frequency spectrum of the Casimir force: Interpretation and a paradox
Department of Energy and Process Engineering, Norwegian University of Science and Technology N-7491 Trondheim, Norway
Corresponding author: firstname.lastname@example.org
Accepted: 16 April 2008
The frequency spectrum of the Casimir force between two plates separated by vacuum as it appears in the Lifshitz formalism is reexamined and generalised as compared to previous works to allow for imperfectly reflecting plates. As previously reported by Ford (Phys. Rev. A, 48 (1993) 2962), the highly oscillatory nature of the frequency dependence of the Casimir force points to possibilities for very large and indeed negative Casimir forces if the frequency-dependent dielectric response, , of the materials could be tuned. A paradox occurs, however, because an alternative calculation of the effect of a perturbation of involving a Wick rotation to imaginary frequencies indicates only very modest effects. A recent experiment appears to convincingly rule out the reality of Ford's optimistic predictions, although given the enormous technological promise of such frequency effects, further theoretical and experimental study is called for.
PACS: 34.20.-b – Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions / 12.20.-m – Quantum electrodynamics / 03.70.+k – Theory of quantized fields
© EPLA, 2008
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