We develop a scale-dependent geometric framework for quantum structure in the four-dimensional scale space (x, y, z, s) introduced in a companion paper 1, in which physical scale is a genuine spatial coordinate with metric dσ² = e^ (2s/L) (dx² + dy² + dz²) + α²ds² (anti-de Sitter space AdS4). Canonical quantisation of the (x, y, z, s) manifold yields explicit correspondences with standard quantum mechanical structure: a Hilbert space of wavefunctions on (x, y, z, s), a Hamiltonian with scale and spatial kinetic terms, canonical commutation relations for both spatial and scale coordinates, and a new scale uncertainty principle ∆s·∆ps ≥ℏ/2. A discrete scale quantum number ns = 0, 1, 2,. . . labels bound states in the scale potential, and a scale momentum ps = mα²˙s is conserved in the absence of gravitational interaction. The Schrodinger equation on (x, y, z, s) separates into spatial and scale equations; the spatial equation has an effective mass meff (s) = me^ (2s/L) that grows exponentially with scale position. This produces a geometric quantum-to-classical transition: quantum behaviour is suppressed at large s (large scales) and dominant at small s (small scales), without invoking any decoherence postulate. The quantum-classical boundary is derived to lie at s∗ ≈−24 nats for biological matter at T = 310 K, coinciding precisely with the known domain of quantum biology. The standard hydrogen spectrum is recovered exactly in the limit L→∞. The leading correction to hydrogen energy levels is δE/E = 2∆s²/L², negligible for atoms in free space (∼4 ×10^−78) but reaching∼10^−6 near neutron stars (L≈6 nats), where it is in principle measurable by X-ray spectroscopy of accreting systems. A path integral treatment confirms the effective mass result and yields a mass renormalisation δm/m = 2∆s²/L² from integrating out scale fluctuations. An emergent time hypothesis follows naturally: the arrow of time is identified with the direction of increasing scale uncertainty. Finally, rotation in the (x, s) plane generates a new conserved quantum observable — scale angular momentum Jxs — which is quantised in half-integer units and represents a new degree of freedom beyond ordinary spatial spin. The quantum probability cloud of a particle is shown to have both spatial and scale components, with scale uncertainty ∆s providing a geometric reason why particles resist being pinned to a precise location. The known quantum numbers n, ℓ, mℓ, ms are mapped onto the six rotation planes of the (x, y, z, s) manifold; three new quantum numbers (jxs, jys, jzs) and one new quantum number of a different type (ns) are predicted. A spin identity conjecture is stated: electron spin ms = ±1/2 may be the jxs = ±1/2 eigenvalue of rotation in the (x, s) plane, pending the Dirac equation on (x, y, z, s). Massless particles (photons) are identified as scale-stationary geodesics with scale extent of order their reduced wavelength; a photon with Jxs ̸̸= 0 carries a new scale polarisation state invisible to standard detectors. An appendix develops the conjecture that the scale coordinate s is complex-valued (s= sR + isI), that the Born rule is the operation projecting the full complex amplitude onto the real subspace sI = 0, and that the imaginary part sI encodes the quantum phase currently discarded by squaring. The connection to the numeric system conjecture of Palmer 20, 21 is made explicit.
Donald G Palmer (Tue,) studied this question.