We present a first-principles derivation of the vacuum speed of light c and all four laws of thermodynamics within the Generative Digital Universe Model (GDUM). Based on six axioms—the 0-dimensional Euler spiral ε₀, topological winding number WK, projection operator Φ, projection benchmark axiom, topological evolution, and the dimensional-postulate principle—we demonstrate that c is not a fundamental constant but a unit-conversion coefficient defined by c ≡ ℓP/tP. The topological critical-velocity uniqueness theorem guarantees its existence and uniqueness in 4-dimensional projected spacetime. Photons correspond to the topological ground state WK = 1, yielding v_γ = c, while the electron velocity follows from projection efficiency η = 2πα with vₑ/c = 2πα ≈ 0. 0458, self-consistently linked to WK ≈ 21. 81. All thermodynamic laws emerge from topological Hilbert-space evolution: the zeroth law from winding-exchange steady states, the first law from topological functional conservation, the second law from intrinsic topological decoherence of isolated systems, and the third law from topological constraints and fluctuations prohibiting T = 0. We construct a unified topological action with no redundant statistical terms, achieving an axiomatic unification of spacetime, electromagnetism, and thermodynamics.
Gao Chenghua (Thu,) studied this question.