Gradient-quartic Brazovskii model
= Gradient-quartic Brazovskii model
A gradient-quartic Brazovskii model stabilizes a negative quadratic gradient coefficient with $\gamma(\nabla^2\phi)^2/2$ and uses the quartic interaction $B\phi^2|\nabla\phi|^2$. For $\gamma,B>0$ and a zero-average <compositional order parameter>, its nonzero-wavevector instability is a candidate for <smectic phase> ordering. The <Gaussian variational kernel for a gradient quartic interaction> shifts both the quadratic coefficients.