Geometric Origin of Gravitational Weakness from Interface-Layer Filtering

DescriptionThis preprint is published as part of the author’s theoretical series, “Fundamental Being Space (FBS) Theory.” In this series, we introduce a working hypothesis in which the Fundamental Being Space (FBS), an interface layer Σ with effective thickness, and ordinary spacetime S_i form a layered structure. Here, Σ is not treated as a zero-thickness boundary or a purely formal interface, but as an intermediate layer with effective thickness through which the structure extends from FBS to ordinary spacetime S_i. In Paper 3, the filtering and attenuation processes associated with gravitational weakness are treated as transmission effects occurring through this finite-thickness interface layer. By examining this framework, we show that a consistent description can be formulated that connects with established physical theories, and we present the results step by step. Overview of Paper 3This paper investigates why gravity is extremely weak compared to electromagnetism. Rather than treating the hierarchy as an arbitrary parameter choice, we model the interface layer Σ as an effective “filter” between FBS and ordinary spacetime S_i. We introduce a multi-sublayer projection/transmission picture in which attenuation accumulates across sublayers, allowing the effective gravitational coupling to be exponentially suppressed while remaining consistent with key experimental constraints, including inverse-square-law tests, equivalence-principle tests, and gravitational-wave observations. We also position the proposed mechanism relative to representative viewpoints on gravity (general relativity, precision tests, and emergent-gravity perspectives), and state clear conditions under which the filtering mechanism would be falsified. Electromagnetism (Paper2) provides the geometric projection mechanism (double-helix → A → E,B) used throughout the series. Series notePaper 3 of the “Fundamental Being Space (FBS) Theory” series. Recommended citationYoshihito Ookawa, Geometric Origin of Gravitational Weakness from Interface-Layer Filtering, Zenodo, 2026. (DOI: 10.5281/zenodo.18240763) Series navigation Paper 1 — “General Discussion on the Reality of Fundamental Being Space (FBS)”We present the overall conceptual framework of FBS theory and introduce the three-tier structure consisting of Fundamental Being Space (FBS), the interface layer Σ, and ordinary spacetime. We also organize the main problems addressed in the series and clarify how the subsequent papers are positioned within this framework.Zenodo: https://zenodo.org/records/18220714 Paper 2 — “Geometric Origin of Electromagnetism from a Double-Helix Structure in the Interface Layer Σ”We derive an effective vector potential A from the geometry and phase difference of a double-helix structure in the interface layer Σ, and show that electromagnetism (E, B) and the Maxwell equations are recovered in the long-wavelength limit.Zenodo: https://zenodo.org/records/18232305 Paper 4 — “Stabilization of the Light-Speed Hierarchy Ci via Tachyonic Modes”We reinterpret “tachyon” not as a particle but as a mode (“tachyonic modes”), and clarify the framework from the viewpoint of stabilizing the light-speed hierarchy Ci and maintaining consistency with dispersion relations.Zenodo: https://zenodo.org/records/18327252 Paper 5 — “Time Generation via Coherence in the Interface Layer Σ: A Coupled Constraint Between the Velocity Width ΔC and the Time Step ΔT”We treat time generation as a constraint/coherence phenomenon in the interface layer Σ, and discuss how observed quantities and the emergence of time follow from a coupled condition between the velocity width ΔC and the time step ΔT.Zenodo: https://zenodo.org/records/18327479 Paper 6 — “Geometric Origin of Effective Mass from Double-Helix Structure and Phase Synchronization: A Defect Model in the Interface Layer Sigma”We propose that effective mass arises from localized defect-like structures formed by phase synchronization and geometric locking in a double-helix configuration of the interface layer Σ, and organize a framework in which mass is interpreted as an emergent property of stable localized states.Zenodo: https://zenodo.org/records/18727897 Paper 7 — “An Experimental and Observational Roadmap for FBS Theory: Testable Predictions and a Minimal Σ-Lagrangian”We present a minimal Σ-Lagrangian and organize the experimental and observational roadmap of FBS theory, separating recovery conditions from prediction degrees of freedom and clarifying how testable spectral and correlation signatures can be used for falsifiability.Zenodo: https://zenodo.org/records/18908943 Paper 8 — “Minimal Conditions for the Interface Σ Derived from Tachyon Processing Conditions”examines tachyon-related conditions across representative existing theories and reorganizes them into a comparative framework. By comparing how such conditions appear, how they are handled, and what structures remain after the process, it extracts common patterns that can be read back toward the FBS framework. Through this reverse reading, the paper explores the minimal structural requirements of the interface layer Σ.Zenodo: https://zenodo.org/records/19647083 VersioningThis preprint may be updated in revised versions. When citing, please specify the DOI and the version. Author informationIndependent Researcher, Japanyosihitoookawa@gmail.comORCID: 0009-0006-8294-5738