The Hidden Thread of Structural Information Evolution: A Comparative Study of Condensed Matter, Quantum Plasma and Black Hole Systems

We propose and systematically argue for a unified cognitive framework — the Hidden Thread of Structural Information Evolution (HTSIE) — spanning condensed matter physics, plasma physics, compact astrophysics, and black hole physics. The central thesis is that as the energy density of a physical system continuously increases, the system traverses a universal evolutionary pathway: from free-particle states through structurally constrained states and shell-encoded states, ultimately arriving at boundary-encoded states. Throughout this progression, the carrier of energy storage migrates from particle kinetic energy to structural arrangement, phase-space topology, and finally to spacetime boundaries, while the dimensionality of information encoding compresses from three-dimensional volume to two-dimensional area. Through systematic comparative analysis of the sequence graphite → diamond → ordinary plasma → quantum plasma (white dwarfs) → neutron stars → black holes, we reveal five categories of hidden knowledge long obscured by disciplinary boundaries: (1) structure itself can store energy; (2) ordering arrangements can store energy; (3) degree-of-freedom freezing is a universal phase transition mechanism; (4) information encoding dimensionality decreases as energy density increases; and (5) the Chandrasekhar limit, TOV limit, and Bekenstein bound are fundamentally limits on information-carrying capacity — three expressions of a single information principle at different energy scales. We further demonstrate that the Chandrasekhar limit corresponds precisely to the point at which the electron Fermi sphere's density of states growth softens in the extreme relativistic limit, exhausting the information-carrying capacity of three-dimensional volume encoding. This framework does not invent new physical laws; it reveals a structural information evolutionary thread long hidden behind disciplinary boundaries.