Cosmic Birefringence as a Quantum-Geometric Signature of the Universal Field Φ in MRUV Cosmology

Recent analyses of cosmic microwave background (CMB) polarization data from the Planck satellite report a non-zero rotation of the plane of linear polarisation of primordial radiation, β = 0. 30° ± 0. 11° (68% C. L. ), a phenomenon known as cosmic birefringence. Within the standard ΛCDM framework this effect is not predicted and typically requires additional physics — axion-like pseudo-scalar fields, Chern-Simons couplings, or other parity-violating mechanisms. In this work we propose that cosmic birefringence arises naturally within MRUV cosmology (Movimento Retilnêo Uniformemente Variado), in which the large-scale dynamics of the Universe is governed by a universal cosmological deceleration field Φ ≈ 5. 571×10⁻¹⁰ m s⁻². The quantum-geometric response of the vacuum to Φ generates a characteristic photon mass scale mγ = ℏΦ/c³ ≈ 2. 18 × 10⁻⁶⁹ kg, which introduces a weak polarisation-transport term in the effective electromagnetic field equations. We derive an expression for the cumulative rotation angle of CMB photons along their cosmological trajectory from recombination (zᵣec ≃ 1100, tᵣec ≃ 3. 8×10⁵ yr) to the present epoch (t₀ ≃ 17. 024 Gyr), and show that the predicted magnitude is consistent with current observational limits. A dimensionless geometric coupling parameter ε is identified and constrained by the Planck measurement. Falsifiable predictions include a redshift-dependent rotation angle α (z) ∝ ∫H⁻¹ (z′) dz′, strict wavelength independence (distinguishing the effect from Faraday rotation), and a correlated signal in polarised radio galaxies. Future observations with the LiteBIRD satellite, the Simons Observatory and CMB-S4 will provide decisive tests. Cosmic birefringence may thus represent a direct quantum-geometric signature of the universal field Φ, linking electromagnetic propagation with the fundamental dynamical structure of the Universe.