A universal framework for dark phenomena, cosmological anomalies, and information conservation Abstract Boundary Dynamics proposes that the most persistent anomalies in cosmology — dark matter, dark energy, the Hubble tension, JWST early massive structures, and the black hole information paradox — all emerge from the geometric and dynamic properties of spacetime boundaries. Across independent frameworks (string theory, brane cosmology, holography, many‑worlds quantum mechanics, and Phase‑Dual Cascade Cosmology), five fundamental boundary properties recur: variable spatial geometry, inverse gravitational coupling, elastic response to stress, information storage capacity, and rupture capability. This universality suggests that boundaries are not model‑specific artifacts but fundamental spacetime structures. Quantitative validation through Phase‑Dual simulations demonstrates extraordinary precision, including exact matches for H₀, spatial H₀ variation, and CMB temperature. The framework provides falsifiable predictions testable within the next decade: gravitational wave phase offsets, void anti‑lensing, spatial H₀ correlations, and white hole candidates in transient surveys. Boundary physics thus transcends individual models, offering a unified empirical domain that bridges abstract theory with observable cosmology. Background Independent theoretical frameworks converge on boundary structures: branes in string theory, warped separations in Randall‑Sundrum cosmology, holographic screens, decoherence frontiers in many‑worlds, and Φ‑boundaries in PDCC. Despite differing assumptions, all predict similar observational consequences. Boundary Dynamics reframes these as manifestations of universal boundary properties, shifting focus from competing models to direct empirical testing of boundary effects themselves. Key Contributions Universal Boundary Properties Variable geometry θ(x) Inverse gravitational coupling Geff(x)=G⋅(1+α/θ(x))G_\text{eff}(x) = G·(1+α/θ(x)) Elastic response and wave propagation Information storage at transfer zones Rupture under critical conditions Unified Explanations Dark matter as geometric coupling variation Dark energy as boundary tension dynamics Hubble tension as spatial variation in expansion rates JWST early structures as pre‑boundary entities Black hole information paradox resolved via boundary compression White holes as rupture phenomena Mathematical Framework Coupled equations governing geometry, tension, gravitational coupling, and expansion Parameter convergence across independent theories Falsifiable Predictions Gravitational wave phase offsets (LIGO O5, 2027–2030) Void anti‑lensing (Euclid, Rubin Observatory, 2025–2035) Spatial H₀ correlation with cosmic web (JWST, 2025–2030) Exotic transients as white hole candidates Repository Contents Main Paper: Boundary Dynamics in Multi‑Universe Physics (V1.0 – Complete Synthesis) Mathematical Formalism: Core equations and parameter estimates Framework Mapping: String theory, brane cosmology, holography, many‑worlds, PDCC Quantitative Validation: Phase‑Dual simulations with precision results Predictions: Testable signatures across cosmology and astrophysics Development Logs: Transparent ITS‑based exploration and refinement Research Impact Boundary Dynamics contributes to theoretical physics by: Establishing boundary physics as a universal explanatory domain Providing falsifiable predictions that constrain multiple frameworks simultaneously Reconciling diverse anomalies through a single mechanistic structure Demonstrating how ITS methodology can unify disparate theories into testable physics Access and Documentation ORCID: https://orcid.org/0009-0003-4876-9273 GitHub: https://github.com/Neuron-Soul-AI/Neuron-Soul-AI LinkedIn: https://www.linkedin.com/in/marcelo-emanuel-paradela-teixeira-702082382/ Email: marcelo.soul.ai@gmail.com License: CC BY‑NC 4.0 © Marcelo Emanuel Paradela Teixeira 2025