The Dark Floor: The 1D Substrate, Electromagnetic Inaccessibility, and the Geometry of the Invisible

The Extended Randall-Sundrum framework [1–6] describes a geometry in which electromagnetic instruments are confined to the top face of a 2D brane surface, while the physical content of the universe extends across multiple dimensional levels and both faces of every crease. This paper identifies a single structural fact — the electromagnetic inaccessibility of the 1D substrate and the bottom face of every dimensional level — and proposes that it accounts for the majority of the open problems in fundamental physics. Seven independent calculations quantify the dark floor: the hierarchy as a depth measurement (e−2kL = 10⁻³²), the Holevo information bound (≤10⁻³⁰ bits per EM interaction), the KK spectral gap (~3.8 TeV), the channel accessibility fraction (6/7 = 85.7% dark), the information entropy exponent ((ℓ_P/R)^N with N = D−4 = 7), the Yukawa coupling cliff (37 e-foldings across the bulk coordinate), and the Born rule approximation quality (deviations bounded by ~10⁻¹⁵ via the Fannes-Audenaert inequality, only two orders above current experimental precision). Dark matter, dark energy, the hierarchy problem, quantum entanglement, wavefunction collapse, the measurement problem, Heisenberg uncertainty, wave-particle duality, the double-slit experiment, the observer problem, quantum decoherence, parity violation, CP violation, the cosmological constant, the Hubble tension, and baryon asymmetry are all consequences of the same instrument limitation. Five established mathematical results — the Holevo bound, the Kochen-Specker theorem, Gleason’s theorem, the Fannes-Audenaert inequality, and the Ryu-Takayanagi formula — provide rigorous underpinning. The unsolved problems list in fundamental physics is an inventory of dark floor phenomena.