Falsification Tests of Grand Consistency Theory

This paper establishes an explicit falsification programme for Grand Consistency Theory (GCT), extending its previously developed theoretical, numerical, observational, and global-inference framework to quantitative empirical rejection criteria. The analysis identifies decisive tests across fundamental constants, particle physics, gravity, cosmology, and dark-sector astrophysics while enforcing one universal microscopic parameter architecture across all physical sectors. Falsification is formulated through four primary routes: microscopic-parameter incompatibility, cross-sector incompatibility, failure of an essential derived physical relation, and failure of an independent out-of-sample prediction. The framework distinguishes auxiliary implementation failure, sector-realization failure, and core-GCT falsification according to the structural status of the tested prediction. A hierarchy of tests is constructed from predictive independence, measurement precision, discriminatory power, theoretical uncertainty, and experimental accessibility, culminating in a falsification map that assigns each primary prediction a required precision, statistical rejection threshold, and theoretical consequence. The strongest tests are cross-sector and leave-one-sector-out predictions in which microscopic parameters constrained outside a physical sector generate a fixed prediction for that sector without microscopic retuning. The resulting framework converts GCT into an operationally falsifiable programme in which specific experimental or observational outcomes provide predefined quantitative criteria for assessing the viability of its unified microscopic description.