Growth tensor ($\mathbf{G}$)

The factor describing local stress-free growth in the morphoelasticity convention $\mathbf{F}=\mathbf{AG}$. Its determinant is the local grown-volume ratio. For $\mathbf{G}=\mathrm{diag}(1,1,\gamma )$, growth changes only the preferred third-direction length, by factor $\gamma$.