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Prehistory – Starting from ’t Hooft’s (1971) we have a short look at Taylor’s and Slavnov’s works (1971–72) and at the lectures given by Rouet and Stora in Lausanne (1973) which determine the transition from pre-history to history. History – We give a brief account of the main analyses and results of the BRS collaboration concerning the renormalized gauge theories, in particular the method...
Abstract: We critically analyze the problem of light propagation in stratified birefringent gyrotropic media by introducing a matrix formulation. As a test model we consider the case of short-pitch chiral smectic-C liquid crystals, for which simple descriptions in terms of an effective gyrotropic homogeneous model and of a microscopic periodic structure are available. By comparing reflectances and...
Optical activity of matter is related to the chirality of its constitutive molecules. In liquid crystals, chiral molecules can give rise to superstructures in which the local dielectric tensor rotates in space describing a helix, a fact which greatly enhances the optical activity of the medium. The structures and the optical properties of some helical phases are well-known, as for instance the cholesteric...
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