The Four-Layer Arithmetic Structure of the Fine-Structure Constant | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article The Four-Layer Arithmetic Structure of the Fine-Structure Constant Jian Zhou This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9335558/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract We propose a conjecture: the fine-structure constant satisfies a four-layer sum rule α (Λφ + τ ζ ′ K (0)) + τ = 1 , where Λφ ≡ 360/φ 2 − ln φ = 137.027 is a constant built from the golden ratio φ = (1 + √ 5)/2, τ ≡ 4 kB TCMB/ER = 6.905×10 −5 is the ratio of the cosmic microwave background thermal energy to the Rydberg energy, and ζ ′ K (0) = − ln φ/2 is the derivative of the Dedekind zeta function of Q(√ 5) at its trivial zero. The four layers are: (i) 360/φ 2 = 137.508, the golden-angle geometric ground state; (ii) − ln φ, the Dirichlet regulator; (iii) τ , the cosmic thermodynamic parameter; and (iv) τ ζ ′ K (0), a cross-term coupling arithmetic and thermodynamic structures. Each successive layer reduces the residual by an order of magnitude: 3400 ppm → 69 ppm → 0.11 ppm → 0.009 ppm. The fourth layer yields α −1 = 137.035 998, matching CODATA 2022 to 0.009 ppm—a 12-fold improvement over the three-layer formula. A refined variant employing the exact Bernoulli sum 1 − φ ln φ achieves α −1 = 137.035 999 16 (δ = +0.6 ppb), within the TCMB measurement uncertainty. Two independent mathematical derivations—the Bernoulli generating function evaluated at the Dirichlet regulator RK = ln φ and the Seeley–DeWitt heat kernel on the hyperbolic symmetric space H 2 of Q(√ 5)— converge to the same first-order expression for the fourth layer, providing structural evidence beyond numerical fitting. Crucially, |ζ ′ K (0)| = ln φ/2 introduces no new parameter: it is the class number formula invariant hK RK /wK , fully determined by φ. We show that 360 = (dK + 1)/ζK (−3), where ζK (−3) = 1/60 = 1/|A5| is a special value of the Dedekind zeta function of Q(√ 5)—establishing that the geometric ground state is a purely number-theoretic quantity, independent of the degree convention. The Fermi–Dirac self-referential fixed point 1/φ shares the same discriminant ∆ = 5, so both quantum statistics select Q(√ 5). We discuss structural correspondences with the Bost– Connes system, the McKay correspondence 2I ↔ E8, a quantitative look-elsewhere analysis, five independent consistency checks, and falsifiable predictions. Full Text Additional Declarations No competing interests reported. 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