Solid as Stacked Surfaces and Casimir Contribution to Piezoelectricity: a Fluidity Spectrum Framework Interpretation

This paper proposes a reinterpretation of solid-state structure using the fluidity spectrum framework, where solids are viewed as slow fluids stabilized by internal surface tension. In this model, solids form by stacking minimal surface-stabilized 3D clusters, which correspond to classical cristalographic unit cells. Extension: I extend the concept by proposing that the fluidity spectrum of solids naturally creates conditions for Casimir-like effects during strains: these internal surfaces approach each other closely enough to restrict vacuum fluctuations, generating Casimir pressures that reinforce or modify polarization.