Verification of the Wave-Expansion Law in GRB 240419A Polarization-Angle Evolution: Polarization Angle as a Direct Reading of Wave-Expansion Distance

【Abstract】 This is Paper No. 13 of the Wave-Expansion Studies series. Paper No. 4 and this paper both describe wave-parameter changes in the Vector 2 direction—the wave-expansion manifestation during the continuous arrival of a light beam. This paper extends the proposition to the field of gamma-ray burst polarization. The angle changes across the three polarization epochs of GRB 240419A (z=5.1777) (86.98°, 75.61°, 70.20°) are precisely reproduced by the zero-parameter prediction of the wave-expansion law. The main-line wave-expansion distance is independently calculated from z (12.00 billion light-years), without using any polarization data. Throughout, time is not introduced as an evolution variable, and no magnetic field, turbulence, or any external cause is introduced. The polarization angle here is a direct reading of wave-expansion distance—measuring the angle is measuring the distance. They are not projections of different dimensions, not two symmetric sides—they are the same class of process. Space is forever constant and unchanging; there is no expansion. Wave-expansion studies are the only framework that uniformly explains all observational anomalies.