The Density Fluid Model answers four fundamental questions in physics: 1. What is spacetime? — Density fluid. A compressible, flowable, wave-like continuous medium. It is the collective behavior of quantum mist. 2. What is gravity? — Density gradient. Objects naturally slide from low-density regions to high-density regions. 3. What is quantum? — Quantum mist. Diffuse, boundless possibility. Upon measurement, the mist collapses to a point. 4. What is entanglement? — Two quantum mists sharing the same density wave mode. Not signal transmission, but holistic synchronization. The model unifies the macroscopic (gravity, spacetime) and microscopic (quantum, particles) using a single concept: density fluid / quantum mist. The macroscopic is the emergent collective behavior of the microscopic. The model makes three testable predictions: 1. Gravitational wave speed anisotropy: Δv/c = 2. 3×10⁻⁶ along binary black hole orbital axis2. Black hole shadow deviation: 1-5% deviation from general relativity3. CMB non-Gaussianity: fNL ≈ 1 Keywords: density fluid, quantum mist, gravity, spacetime, quantum, entanglement, unified theory
Chenglin Wu (Mon,) studied this question.