A Substrate Model with Dimension-Dependent Force and Pressure-Induced Black Hole Inversion

A speculative toy model proposing a single substrate field Ψ operating pointwise at quantum level. At low D (3D) it manifests as spherically-limited attractive force F_3D(r) = (k*M/r²)*exp(-r/R_lim). At high D (Bulk) it manifests as pervasive pressure Ψ_MAX. The conflict P_dark = Ψ_MAX - F_3D drives cosmic expansion. At black hole collapse (F_3D -> ∞), P_dark is excluded until external pressure exceeds P_crit, inverting from expansive to creative: ΔM = η*P_dark. The model yields a self-recycling breathing universe. Interactive simulator included in extended version. Status: speculative, not peer-reviewed.