Alternative derivation of the Feigel effect and call for its experimental verification

Details Alternative derivation of the Feigel effect and call for its experimental verification Alternative derivation of the Feigel effect and call for its experimental verification

2010-08-21

arxiv.org/abs/1008.3656v3

Proc. R. Soc. A 2012 vol. 468 pp. 429-447

Physics

Condensed Matter

Soft Condensed Matter

20 pages, 1 figures. revised and improved version

Scientific paper

10.1098/rspa.2011.0481

A recent theory by Feigel [Phys. Rev. Lett. {\bf 92}, 020404 (2004)] predicts the finite transfer of momentum from the quantum vacuum to a fluid placed in strong perpendicular electric and magnetic fields. The momentum transfer arises because of the optically anisotropic magnetoelectric response induced in the fluid by the fields. After summarising Feigel's original assumptions and derivation (corrected of trivial mistakes), we rederive the same result by a simpler route, validating Feigel's semi-classical approach. We then derive the stress exerted by the vacuum on the fluid which, if the Feigel hypothesis is correct, should induce a Poiseuille flow in a tube with maximum speed $\approx 100\mu$m/s (2000 times larger than Feigel's original prediction). An experiment is suggested to test this prediction for an organometallic fluid in a tube passing through the bore of a high strength magnet. The predicted flow can be measured directly by tracking microscopy or indirectly by measuring the flow rate ($\approx 1$ml/min) corresponding to the Poiseuille flow. A second experiment is also proposed whereby a `vacuum radiometer' is used to test a recent prediction that the net force on a magnetoelectric slab in the vacuum should be zero.

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