Statistics – Applications
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..458..968m&link_type=abstract
Space technology and applications international forum -1999. AIP Conference Proceedings, Volume 458, pp. 968-973 (1999).
Statistics
Applications
Quantum Electrodynamics
Scientific paper
Two infinite parallel uncharged conducting planes experience an attractive force between them (called the Casimir force) due to the alteration of the zero point electromagnetic field between the plates. Similarly, there are forces on the surfaces of a rectangular cavity with conductive walls of dimension a1,a2,a3. Recently a paradox was published describing a method for the extraction of mechanical energy from the zero point fluctuations of the electromagnetic field in a rectangular conductive cavity by cyclical changes in the dimensions of the walls without doing any work (Forward, 1998). The validity of the analysis depends on the implicit assumption that the energy density within the cavity is approximately isotropic, so that positive average energy densities within the cavity result in outward forces, and negative average energy densities result in attractive forces. However, detailed computations of the forces on the cavity walls show this assumption is not valid, and that there are positive energy regions in which there are outward forces on some faces and inward forces on other faces (Hacyan, 1993). Specifically, for a cavity with a1=a2=1 the energy is positive for 0.4
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