Satisfaction of the eigenvalue constraints on the $Q$tensor
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The Mathematics of Liquid Crystals
We discuss how Onsager theory with the MaierSaupe interaction leads naturally to a bulk free energy depending on the $Q$tensor that blows up as the minimum eigenvalue $lambda_{
m min}(Q)
ightarrow 1/3$, using methods closely related to those of Katriel, Kventsel, Luckhurst and Sluckin (1986). With this bulk energy, and in the one constant approximation for the elastic energy, it is shown that for suitable boundary conditions, minimizers $Q$ of the total free energy for a nematic liquid crystal filling a region $Omega$ satisfy the physical requirement that $inf_{xinOmega}lambda_{
m min}(Q(x))>1/3$.
This talk is part of the Isaac Newton Institute Seminar Series series.
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