A State-Variable Theory of Evolving Material Symmetry
Material architecture can evolve during loading, yet its mechanically expressed symmetry depends on both the structural state and the constitutive coupling. We connect these quantities through one parent-invariant free energy with a symmetric traceless internal tensor $\mathbf Q$. Its stabilizer distinguishes isotropic, uniaxial, and biaxial states, and projected gradient kinetics satisfies the structural dissipation inequality. Parent invariance generally guarantees only symmetry inheritance. For an explicit two-coupling elastic potential, we derive a stiffness-contraction reconstruction of $\mathbf Q$ and prove equality of the structural and tangent rotational symmetries for every nonzero coupling pair. The associated acoustic tensor links residual symmetry to protected transverse degeneracies. For a small uniaxial state, the leading squared-speed gap is $|γ_2s|\sin^2\vartheta/(2ρ_0)$; coupling selectivity and residual protection can suppress this term. We also derive a directional acoustic-trace reconstruction and state calibrated and nuisance-aware inverse conditions. Dimensionless structural-field, acoustic, transient finite-element, and synthetic inverse examples illustrate the predictions. The framework connects state evolution, mechanically expressed symmetry, and conditional observability without assigning independent dynamics to a group label.