A Diffusion-Surface Tension Model for the Expansion of the Universe

We propose a novel mechanism for cosmic acceleration based on quantum-field-induced surface tension at the boundary of the universe. The model posits that tension (σ) between spacetime and the quantum vacuum grows exponentially with the surface area (A(t)), generating a negative pressure that drives accelerated expansion. Unlike the cosmological constant, this approach dynamically links acceleration to the universe's geometry and predicts testable deviations from ΛCDM at late times.