BFUT P18 Weak Gravitational Lensing Validation Pipeline Using Finite-Domain Substrate Gravity Without Dark Matter Halos

This deposit contains the BFUT weak gravitational lensing validation pipeline developed within the Big Flare-Up Theory (BFUT) finite-domain gravitational framework.The pipeline operationalizes the modified finite-domain substrate-gravity structure developed in BFUT Papers 18 and 19 and applies it to real public weak gravitational lensing observations using lightweight pre-binned galaxy-galaxy lensing datasets.The validation uses public KiDS weak-lensing data from the Brouwer et al. (2021) RAR release and compares:BFUT finite-domain substrate profiles,against standard NFW-like dark matter halo profiles.The BFUT framework reproduces observed weak-lensing structure using:finite-domain relaxation,rotational substrate persistence,and nested organized deformation domains, without requiring giant independently tuned invisible dark matter halos.The validation specifically tests whether the same finite-domain organizational structure previously used in the BFUT 175-galaxy rotation-curve programme can also reproduce weak gravitational lensing observations. The results demonstrate stable parameter reuse, strong outer-profile decline agreement, and competitive or superior residual behaviour relative to standard halo-based fitting approaches.The deposit includes:Python validation pipeline,parameter tables,χ² comparison tables,AIC/BIC comparison tables,generated residual and overlay plots,and reproducibility documentation.The same finite-domain organizational structure was additionally extended to representative SDSS galaxy-galaxy lensing profiles and representative cluster-scale lensing regimes without modification of the underlying framework.This deposit therefore represents the first-stage real-data weak gravitational lensing validation programme for the BFUT finite-domain substrate gravity framework.Keywords:BFUT, weak gravitational lensing, modified gravity, dark matter alternative, finite-domain gravity, galaxy-galaxy lensing, KiDS survey, SDSS lensing, substrate gravity, gravitational curvature, galaxy rotation curves, NFW alternative, emergent gravity, cosmology, gravitational physics