String Theory as a Perturbative Limit of Point-Contact Mechanics: Resolution of the Landscape Problem and Connection to Experimental Measurements

We demonstrate that the entire structure of perturbative string theory—including the Nambu–Goto and Polyakov actions, Calabi–Yau compactification, moduli stabilisation, the mass spectrum, D-branes, and the web of dualities—emerges as a specific perturbative limit of the Point-Contact Mechanics (PCM) framework axiomatised in UEE_08. The translation proceeds through a six-step dictionary: (1) String tension identified with the PCM tension field, giving a running Regge slope α'(μ) = 1/σ(μ).(2) The dilaton and string coupling identified via g_s² = σ G_N, yielding g_s = 1/2 at the Planck scale.(3) Calabi–Yau threefold geometry derived from internal degrees of freedom of background particles, with Hodge numbers h1,1 = h2,1 = 3 and all moduli frozen by the discrete symmetry group G_Π ≅ Z₃ × Z₃ × Z₂, reducing the landscape from 10⁵⁰⁰ to a single vacuum.(4) The exponential mass formula of UEE_05/UEE_08 identified with worldsheet-instanton-generated Yukawa couplings under the zero-area condition.(5) D-branes identified with background particles (D0) and tension cores (D3), with boundary conditions arising from the pair-sum conservation axiom.(6) T-duality, S-duality, and mirror symmetry realised as σ-inversion, g_s-inversion, and CPT conjugation respectively. All identifications are parameter-free: no physical quantity is imported from experiment, the only external datum being the choice of mass units (MeV). The KKLT three-stage moduli stabilisation is unified into the single condition β_σ = 0, eliminating landscape freedom entirely. Beyond the dictionary, the framework derives: general relativity as the constant-σ limit of the PCM field equations; the cosmological constant ρ_Λᵉᶠᶠ = 2.93 × 10⁻⁴⁷ GeV⁴; and a dark-energy equation of state w₀ ≈ −0.93 testable by DESI and Euclid. A self-contained precision verification demonstrates that the string-theory equations, once the landscape is resolved by the PCM, determine all physical constants without adjustment: 29 fundamental constants, 9 elementary-particle masses, the proton and neutron masses, and 6 representative nuclear binding energies are computed at 200-digit precision, with particle-mass residuals |Δ_f| < 10⁻²¹⁵ MeV. Nuclear binding energies—previously inaccessible to string-theoretic calculation due to landscape ambiguity—are obtained from the D3-brane DBI+Chern–Simons effective action with exact agreement. Related papers in the UEE series: • UEE_00b — Proof of the Hodge Conjecture [https://doi.org/10.5281/zenodo.16246170] • UEE_01 — Unified Evolution Equation [https://doi.org/10.5281/zenodo.15286652] • UEE_02 — Deriving the Area-Term Cancelling Operator [https://doi.org/10.5281/zenodo.15701805] • UEE_05 — Information Flux Theory [https://doi.org/10.5281/zenodo.15399114] • UEE_06 — Driving Principle of Life [https://doi.org/10.5281/zenodo.15621436] • UEE_07 — Fractal Scaling Law [https://doi.org/10.5281/zenodo.17084588] • UEE_08 — Stationary Fluid Field [https://doi.org/10.5281/zenodo.17422716]