Abstract

We derive statistical mechanics and Hamiltonian dynamics solely from the algebraic structure of M_3(C), the minimal noncommutative finite-dimensional C*-algebra, within the Cognitional Mechanics (CM) framework. Four foundational hypotheses of conventional statistical mechanics are structurally superseded without replacement by new assumptions: the equal a priori probability postulate (H1), the ergodic hypothesis (H2), the external heat bath assumption (H3), and the empirical definition of the inverse temperature beta (H4). The principal results are: (i) the Hamiltonian H emerges as a structural necessity via the Skolem-Noether theorem and Stone's theorem, superseding H3; (ii) the unique SU(n)-covariant depolarizing channel Phi with contraction rate lambda = 8/9 is fixed by the relative dimension 1/n^2 of the invariant subspace, superseding H1 and H2; (iii) the inverse temperature beta_structure = tau / Delta_E = [1/|log(8/9)|] / [3/sqrt(2)] approximately 4.002 is a pure structural invariant fixed by Casimir normalization, dissolving the circularity of H4; (iv) the canonical ensemble rho_eq = exp(-beta H) / Z is the unique entropy-maximizing state consistent with the algebra; (v) all three thermodynamic laws follow as algebraic theorems from Klein's inequality and the spectral structure of M_3(C); (vi) the projection factor kappa_T = 1.000031, determined via the CM-implied gravitational coupling G_implied = 6.67471 x 10^-11 m^3 kg^-1 s^-2, closes the Planck temperature scale as a structural invariant. The residual |kappa_T - 1| = 3.1 x 10^-5 lies within the experimental scatter of independent G measurements (5.5 x 10^-4). No external probabilistic assumptions, empirical calibration, or free parameters are introduced. Statistical mechanics and thermodynamics are not empirical frameworks imposed on nature; they are necessary consequences of the minimal noncommutative algebra M_3(C). Published March 7, 2026 DOI:10.5281/zenodo.18899522