Reconstructing the Cosmic Missing Baryon Reservoir Through Warm–Hot Intergalactic Medium Emergence

This study presents a high-resolution cosmological simulation that reconstructs the full distribution of the Universe’s long-sought missing baryonic matter. Using a physics stack incorporating baryon diffusion, shock heating, filament-driven thermalization, and intergalactic plasma dynamics, the system converges on a stable 66-node cosmic lattice with zero topology variance. The results reveal that the missing baryons reside primarily in warm–hot intergalactic filaments and void-boundary plasma layers, forming coherent structures that evade conventional observational detection. The recovered distribution provides a complete theoretical solution to the missing baryon problem and offers testable predictions for future X-ray, UV, and tSZ observational campaigns.