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Starting Cosmological Simulations from the Big Bang.

Florian List1, Oliver Hahn1, Cornelius Rampf1

  • 1Department of Astrophysics, University of Vienna, Türkenschanzstraße 17, 1180 Vienna, Austria and Department of Mathematics, University of Vienna, Oskar-Morgenstern-Platz 1, 1090 Vienna, Austria.

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This summary is machine-generated.

We developed a unified numerical method for cosmic large-scale structure (LSS) simulations. This approach enables fast, accurate, and complete modeling of LSS observables, bridging fundamental physics and astronomical data.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Computational Physics

Background:

  • Cosmic large-scale structure (LSS) is crucial for testing fundamental physics against astronomical observations.
  • Current modeling methods, N-body simulations and perturbative techniques, have limitations.
  • A unified approach is needed to overcome these shortcomings.

Purpose of the Study:

  • To present the first unified numerical approach for modeling cosmic large-scale structure.
  • To demonstrate the convergence and capabilities of this new simulation method.
  • To enable fast, self-consistent, and UV-complete forward modeling of LSS observables.

Main Methods:

  • Developed novel time integration and discreteness reduction schemes.
  • Implemented a unified numerical approach for N-body simulations.
  • Demonstrated field-level convergence of the simulations.

Main Results:

  • Simulations can be initialized directly at time zero.
  • The method achieves agreement with high-order Lagrangian perturbation theory in the fluid limit.
  • The approach enables fast and self-consistent forward modeling.

Conclusions:

  • The new unified numerical approach overcomes limitations of existing methods.
  • This technique provides a powerful tool for studying cosmic large-scale structure.
  • It facilitates connecting fundamental physics with astronomical observations through improved LSS modeling.