Cosmological Braking Theory (CBT): Apparent Accelerated Expansion from Temporal Dilation Induced by a Cosmological Electromagnetic Condensate

We propose the Cosmological Braking Theory (CBT), a framework in which the apparent accelerated expansion of the Universe arises from temporal dilation of matter induced by a cosmological electromagnetic background, characterised by the fine-structure constant α = 1/137. 036. The theory introduces no internal free parameters beyond the five standard observables (α, Ωm, Ωr, H0, Mp), all measured independently of CBT. The central equation, H² (z) = H₀² N (z) /D (z) with D (z) = 1 − Ωf (1+z) ³ + Ωf² (1+z) ⁶ and Ωf = Ωmα, is consistent with a conformal effective metric φ (z) gμν for the matter sector under the condition of magnetic equipartition PB = ΩfPm (Postulate 1). The exponent n = 3 follows from the requirement PB ∝ Pm. The modified Friedmann equation is verified numerically to 10⁻⁸ precision and satisfies the Bianchi identities; its formal analytical derivation is the subject of a companion paper 16. The theory yields several parameter-free predictions: (i) a quantum rebound at zc = (1/ΩmΩf) ^1/3 − 1 = 6. 539, coinciding with the end of reionisation; (ii) a dark matter particle mass mpart = 2. 003 keV produced non-thermally by the Born-Infeld condensate, with an effective temperature Teff/Tthermal ∼ α⁴ ∼ 10⁻⁹, making Lyman-α thermal bounds inapplicable; (iii) ΩΛ = 0. 6826, consistent with Planck 2018 at 0. 35%; (iv) CMB acoustic angle Δθ*/θ* < 0. 1% (semi-analytic). The model is found consistent with 13 independent observational benchmarks. The DESI wₐ tension is reduced from 3. 90 to 1. 60 after geodesic corrections.