Emergence of Arrow-of-Time Asymmetry from Low-Entropy Early-Universe Conditions: Results from a 900-Billion-Year Forward Simulation

This study presents a large-scale forward simulation examining the emergence of macroscopic arrow-of-time asymmetry under extremely low-entropy, early-universe boundary conditions. The model evolves a high-energy spacetime domain across 9×10¹¹ years while incorporating relativistic gravity, spacetime curvature dynamics, vacuum-fluctuation fields, gravitational-wave coupling, entropy-gradient response, temporal-symmetry breaking, dark-energy dynamics, and topological defect evolution. The system converges on a highly stable 55-node global-field attractor with zero topology variance across 65,536 ensemble trajectories. The simulation also produces a reproducible structural blueprint composed of abstract field-mode placeholders (H, D, Q, Φ, χ), each carrying a unique high-dimensional state vector and emergent physical properties. The results demonstrate that temporal asymmetry can arise spontaneously from curvature–vacuum interactions and early symmetry-breaking processes, without requiring imposed time directionality. Findings highlight implications for the origin of time’s arrow, early-universe thermodynamics, emergent field behavior, and large-scale cosmological stability.