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Explore cutting-edge computational methods for modeling the early universe through this 13-minute conference talk from the Erwin Schrödinger International Institute workshop on cosmic large-scale structure. Discover how new lattice-based simulation codes can accurately model multifield inflationary scenarios, with particular focus on axion-U(1) inflation models. Learn about the sophisticated phenomenological features these simulations reveal, including modified small-scale power spectra, blue-tilted equilateral-peaked bispectra with complex non-separable forms, and higher-order correlation functions that break parity symmetry. Understand how these advanced simulations generate primordial curvature field realizations with intricate N-point statistical hierarchies that cannot be produced using conventional non-Gaussian initial condition techniques. Examine the revolutionary approach of connecting inflation simulations directly to N-body simulations, enabling complete modeling of cosmic evolution from the inflationary epoch through to late-time large-scale structure formation. Gain insights into how this comprehensive simulation framework characterizes observable predictions for galaxy surveys and establishes inflation simulation as a crucial tool for testing early-universe theoretical models.
