Biaxial nematic



A biaxial nematic is a spatially homogeneous order parameter tensor of a biaxial nematic has the form

Q= \begin{pmatrix} -\frac{1}{2}S+T & 0 &0 \\ 0 &-\frac{1}{2}S-T & 0 \\ 0 & 0& S\\ \end{pmatrix}