Fluid Cosmic Crystal Theory (FCCT v1.0): Effective Elastic Spacetime, Phase Dynamics, and Multicritical Transitions

This submission presents Version 0.1 of the Fluid Cosmic Crystal Theory (FCCT), establishing the foundational static framework that models the quantum vacuum as a macroscopic solid-state elastic lattice. Utilizing a renormalized Ginzburg-Landau potential, this initial model quantifies spacetime phase transitions driven by the topological defect density (p) and an effective phase order coefficient (αeff). By mapping the critical percolation threshold (pc), FCCT v0.1 successfully outlines a multicritical point where standard continuous geometry collapses. This framework provides a rigorous thermodynamic mechanism to resolve classical singularities via a transition to a superfluid vacuum phase, while phenomenologically modeling Dark Matter as the residual geometric strain of an amorphous, glass-like spacetime phase.