The Thermodynamic and Geometric Impossibility of Inter-Universal Wormholes in a Null Void-Based Multiverse Model

The Thermodynamic and Geometric Impossibility of Inter-Universal Wormholes in a Null Void-Based Multiverse Model is the second paper in the Gravitational Drainage Cosmology series. Building upon the framework established in Part 1, this paper explores the implications of the "Null Void" and rigorously demonstrates why inter-universal travel remains a physical impossibility. Core Concept: The Isolated Multiverse While the Null Void itself is an absolute zero-energy background, the thermodynamic instability of infinite-density primordial singularities at its boundary suggests the theoretical possibility of a multiverse, arising via spontaneous stochastic nucleation (akin to a "popcorn effect"). However, this paper argues that even if a pluralistic cosmos exists, physical connectivity between distinct universes via Einstein-Rosen bridges (wormholes) is strictly forbidden by fluid dynamics and thermodynamics. The Three Fundamental Constraints of Wormhole Formation: Constraint I (Shear Stress): The differential expansion vectors and asynchronous Hubble parameters of independently formed universes would generate infinite macroscopic shear stress, instantly rupturing any connecting spacetime fabric. Constraint II (Impedance Mismatch): Varying mass-energy densities between universes create an extreme gravitational characteristic impedance mismatch, causing total energy reflection and rejection at the boundary. Constraint III (Null Void Separation): The inherent curvature of 3D spatial membranes ensures that even in tangential contact, an unbridgeable interstitial vacuum gap of absolute zero pressure always remains, perfectly insulating the universes. Author's Note: Consistent with the series, this study relies on physical intuition, thermodynamic principles, and geometric visualization. As an independent researcher, the author acknowledges the lack of formal equations and invites the scientific community to mathematically formalize these physical impossibilities through tensor calculus, cosmological wave mechanics, and advanced topology.