Gravitational Tunneling II:Bidirectional Manifold Cosmology: Gravitational Concave Lensing, Distributed Injection Events, and the Decompression Phase Transition of Black Holes — A Unified Explanation for Dark Matter and Cosmic Voids Based on the Inertial Snap-Through Model

Abstract As an extension of previous research titled "Gravitational Tunneling via Inertial Snap-Through and Cosmogenesis," this paper further investigates the evolutionary mechanisms and macroscopic observational effects of matter after traversing the Schwarzschild radius into a negative manifold. Based on a topological extension of General Relativity, we propose a "Bidirectional Manifold Matter Circulation Model." First, this study refines the mechanism of "Topological Inversion." We postulate that when baryonic matter crosses the event horizon and experiences the extremum of spacetime curvature (the "Hairpin Turn"), its geometric structure undergoes an eversion—turning inside out—resulting in a parity inversion of charge. Consequently, this matter exists in "Negative Space" with negative distance attributes relative to our manifold. Second, we propose Gravitational Concave Lensing as a critical method for detecting celestial bodies in negative space. The model predicts that massive black holes located in the negative manifold project an equivalent repulsive potential onto the positive space, causing light paths to diverge. This mechanism provides a robust explanation for the formation of Cosmic Voids and the apparent deficit of matter density within them. Third, this paper revises the traditional single-singularity Big Bang theory, introducing the "Distributed Injection Events" hypothesis. We argue that the Cosmic Microwave Background (CMB) is not the remnant of a single temporal origin but the integral superposition of countless matter "ejections" resulting from the collapse of black holes in the negative space. These isotropic spherical injections account for the anomalous presence of mature galaxies in the early universe, as observed by JWST. Finally, we describe the ultimate fate of black holes not as complete evaporation via Hawking radiation, but as a "Decompression Phase Transition." As matter flows back from negative space to positive space, the gravitational binding energy of the source black hole decreases. Consequently, the degenerate matter within the horizon undergoes an inverse phase transition, leading to nucleosynthesis and a return to the main sequence of stellar evolution. This model achieves dynamic conservation of total cosmic mass across the bidirectional manifold without invoking exotic particles.