Additional note for version 3 This third release emphasizes the derivation and role of the Lorentz factor within the Optical–Gravitational Field (OGF) framework. In OGF the factor does not arise from spacetime geometry but from the energetic contribution of motion to the scalar optical field. All internal rhythms and spatial scales are shown to co-vary according to this physical law, leading to an isotropic contraction and a natural explanation of the Lorentz factor as a field-driven effect. This reformulation clarifies the conceptual departure from Einstein’s relativity while preserving agreement with classical experimental tests. Keywords: alternative gravity theory; variable speed of light; Lorentz factor; light deflection; Shapiro delay; gravitational waves; information conservation.

The Optical-Gravity Field (OGF) is a scalar-field framework that reproduces classical GR tests (light deflection, Shapiro delay, perihelion precession, GPS corrections) while adopting a different interpretation: gravity modulates local optical properties and local process rhythms; proper time and a spacetime metric are not required at the operational level. The Lorentz-type slowdown in moving systems is attributed to field intensification due to motion. The work also outlines strong-field predictions (optical hyper-slowing without geometric horizons) and two feasible discriminators (rotor/cavity at the same altitude; one-way vertical optical TOF).

Description:This is the updated version of Optical-Gravity Field: Foundations, Principles and Classical Tests.Compared to the version deposited on 20 August 2025, it includes a complete set of appendices (A–F), with detailed treatments of: the train thought experiment (Appendix A), the variational principle (Appendix B), the dynamics of massive particles (Appendix C), waves and interferometric response (Appendix D), light deflection near the Sun (Appendix E), and a conclusive prediction on strong-field regimes (Appendix F). The main text remains unchanged; this release consolidates the work with the extended appendices.