Inter-Universe Corridor Hypothesis

V3 replaces the direct scalar–Kretschmann coupling of V2 with a scalar–Gauss–Bonnet coupling. Thepurpose is not to claim that the original idea is proven, but to move its most problematic mathematicalcomponent into a better-studied class of modified-gravity models. A dimensionless Schwarzschildtest-field problem is solved numerically. The first three static zero-mode thresholds are found atα≈2.90186, 19.50162 and 50.93073 for the chosen normalization. These are bifurcation/zero-modediagnostics, not direct evidence for baby-universe formation. V3 also defines a stricter route fromcurvature-triggered scalar activation to a possible geometric throat/branch, while explicitly identifying themissing step: a fully nonlinear spacetime solution demonstrating a new causally disconnected region