"Elastic Field and Harmonic Periodization: Matter as Standing Resonance (Part III)"

This third part of the Elastic Field Series presents matter as a stable standing resonance of the elastic vacuum field.Building on the previous works that interpreted electric charge as orientation and gravitation as longitudinal compression, it introduces the concept of a fundamental lattice step comparable to the Planck length.The paper proposes that the periodicity of chemical elements originates from harmonic resonances of the vacuum lattice and that dark matter corresponds to subharmonic and superharmonic modes—non-luminous yet gravitationally active states of the same field.