Symmetry Breakdown in Posner Molecules Invalidates Quantum Spin Protection Model — E8 Intelligence Research

Andrew Stewart Caldin

Published Oct 5, 2026• 0 citations

Abstract

FINDING: The Posner molecule (Ca₉(PO₄)₆) — previously proposed as a biological quantum information processor via long-lived nuclear spins — is shown to lack the high symmetry (C₁ or C₃) assumed for its nuclear spin Hilbert space; its dynamical ensemble is not symmetric, invalidating the simple permutation-symmetry protection model. MATH: - Molecular point group: Ca₉(PO₄)₆ — actual symmetry is **C₁** (no nontrivial rotational or reflection symmetries) in the dynamical ensemble, not the idealized **C₃** or higher. - Nuclear spin Hilbert space dimension: For ⁴³Ca (I=7/2) and ³¹P (I=1/2), with 9 Ca and 6 P nuclei: dim(H) = (2·7/2+1)⁹ × (2·1/2+1)⁶ = 8⁹ × 2⁶ = 2²⁷ × 2⁶ = 2³³ ≈ 8.59×10⁹. - Symmetry reduction: Under C₃, the Hilbert space decomposes into irreducible representations (A, E) — but with C₁, no such block diagonalization; all 2³³ states mix under the molecular Hamiltonian. - Key result (arXiv:2108.08822v2): The dynamical ensemble average over molecular orientations and Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com

DOI: 10.5281/zenodo.23152243

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