2,854 research outputs found
Electromagnetic Waves in a Rotating Frame of Reference
We discuss the electromagnetic measurements of rotating observers and study
the propagation of electromagnetic waves in a uniformly rotating frame of
reference. The phenomenon of helicity-rotation coupling is elucidated and some
of the observational consequences of the coupling of the spin of a particle
with the rotation of a gravitational source are briefly examined.Comment: LaTeX file, 2 PS figures, 18 pages, a few minor corrections, accepted
for publication in Annalen der Physik, in pres
Ring-Pattern Dynamics in Smectic-C* and Smectic-C_A* Freely Suspended Liquid Crystal Films
Ring patterns of concentric 2pi-solitons in molecular orientation, form in
freely suspended chiral smectic-C films in response to an in-plane rotating
electric field. We present measurements of the zero-field relaxation of ring
patterns and of the driven dynamics of ring formation under conditions of
synchronous winding, and a simple model which enables their quantitative
description in low polarization DOBAMBC. In smectic C_A* TFMHPOBC we observe an
odd-even layer number effect, with odd number layer films exhibiting order of
magnitude slower relaxation rates than even layer films. We show that this rate
difference is due to much larger spontaneous polarization in odd number layer
films.Comment: 4 RevTeX pgs, 4 eps figures, submitted to Phys. Rev. Let
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