Izvorni znanstveni članak

Medium-assisted vacuum force

M. S. Tomaš ; Ruđer Bošković Institute, P.O.B. 180, 10 002 Zagreb, Croatia

Sažetak

We discuss some implications of a very recently obtained result for the force on a slab in a planar cavity based on the calculation of the vacuum Lorentz force [C. Raabe and D.-G. Welsch, Phys. Rev. A 71 (2005) 013814]. We demonstrate that, according to this formula, the total force on the slab consists of a medium-screened Casimir force and, in addition to it, a medium-assisted force. The sign of of the medium-assisted force is determined solely by the properties of the cavity mirrors. In the Lifshitz configuration, this force is proportional to 1/d at small distances and is very small compared with the corresponding van der Waals force. At large distances, however, it is proportional to 1/d4 and comparable with the Casimir force, especially for denser media. The exponents in these power laws decrease by 1 in the case of a thin slab. The formula for the medium-assisted force also describes the force on a layer of the cavity medium, which has similar properties. For dilute media, it implies an atom-mirror interaction of the Coulomb type at small and of the Casimir-Polder type at large atom-mirror distances. For a perfectly reflecting mirror, the latter force is effectively only three-times smaller than the Casimir-Polder force.

Ključne riječi

Casimir effect; Lorentz-force approach; medium-assisted force

Hrčak ID:

301943

URI

https://hrcak.srce.hr/301943

Datum izdavanja:

1.3.2005.

Podaci na drugim jezicima: hrvatski

Posjeta: 167 *