The Cosmological Kibble Mechanism in the Laboratory: String Formation in Liquid Crystals

Abstract

We have observed the production of strings (disclination lines and loops) via the Kibble mechanism of domain (bubble) formation in the isotropic to nematic phase transition of a sample of uniaxial nematic liquid crystal. The probablity of string formation per bubble is measured to be $0.33\pm 0.01$. This is in good agreement with the theoretical value $1/\pi$ expected in two dimensions for the order parameter space $S^2/{\mathbf{Z}}_2$ of a simple uniaxial nematic liquid crystal.

17 pages, in TEX, 2 figures (not included, available on request)

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