Unified Quantum Hydrodynamic Cosmology: Interacting Quantum Fluid Bubble Networks and Emergent Spacetime Structures

The standard cosmological model (ΛCDM), despite its success in describing large-scale structures, faces severeontological challenges regarding the nature of dark energy, the vacuum catastrophe, and the singularity problem.This paper proposes and rigorously refines an alternative theoretical framework: the universe as a macroscopicquantum phenomenon described by a complex network of interacting quantum fluid "bubbles"—a "Cosmic Foam."Based on the physics of binary Bose-Einstein Condensates (BECs), Superfluid Vacuum Theory (SVT), and theLogarithmic Schrödinger Equation (LogSE), we demonstrate that spacetime emerges as an effective acoustic metricwithin a multi-phase superfluid substrate. We explore domain wall dynamics formed via the Kibble-Zurek mechanism,the emergence of gravity from fluid density gradients, and the thermodynamic origin of the arrow of time. Bytreating the vacuum as a logarithmic superfluid, we resolve the separability issue of non-interacting subsystemsand provide a natural mechanism for mass generation and dark sector unification. Furthermore, we address theundecidability of the spectral gap in continuous fluids, suggesting intrinsic computational limits to cosmic evolution.Falsifiable predictions, including Porod tails in the CMB power spectrum and gravitational wave signatures frombubble collisions, are presented.