PBT: Light

Light in PBT bends via refraction through density gradients in the medium, rather than spacetime curvature — deliberately built to match GR’s weak-field prediction ($\theta \approx 4GM/(c^2b) \approx 1.75’’$ for the Sun) rather than diverge from it.

Covered in: Paper 2 (light bending derivation), Paper 12 (summary equation). See also What Would Actually Distinguish PBT From General Relativity, which notes this specific prediction is a consistency check with GR, not a point of difference.