Ginnungagap -- a massively parallel cosmological initial conditions generator
arXiv:2511.10353 · doi:10.1016/j.ascom.2026.101082
Abstract
Ginnungagap is a fully parallel (MPI+OpenMP) code designed to generate cosmological initial conditions for simulations involving very large numbers of particles. It operates in several modes, including the creation of initial conditions with either uniform or spatially varying resolution (for "zoom-in" simulations). The initial conditions can be fully random or derived by extending the resolution of existing ones while preserving the large-scale structures. Ginnungagap is open source and modular, consisting of a collection of independent tools that can be used for a variety of tasks. In this paper, we describe the main features of Ginnungagap and present test results for different types of simulations prepared with it.
Accepted in Astronomy and Computing
References in corpus (21)
- The cosmological simulation code GADGET-2
- Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
- Mass function of dark matter halos
- Ahf: Amiga's Halo Finder
- Enzo: An Adaptive Mesh Refinement Code for Astrophysics
- Multi-scale initial conditions for cosmological simulations
- The Arepo public code release
- Simulating cosmic structure formation with the GADGET-4 code
- Multiscale Gaussian Random Fields for Cosmological Simulations
- The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications
- P3DFFT: a framework for parallel computations of Fourier transforms in three dimensions
- Initial conditions to cosmological N-body simulations, or how to run an ensemble of simulations
- How to Zoom: Bias, Contamination, and Lagrange Volumes in Multimass Cosmological Simulations
- The Hestia project: simulations of the Local Group
- A new way of setting the phases for cosmological multi-scale Gaussian initial conditions
- Second-order Lagrangian perturbation theory initial conditions for resimulations
- SWIFT: A modern highly-parallel gravity and smoothed particle hydrodynamics solver for astrophysical and cosmological applications
- Accurate initial conditions for cosmological N-body simulations: Minimizing truncation and discreteness errors
- Constrained Local UniversE Simulations: A Local Group Factory
- Generating Cosmological Gaussian Random Fields
- Simulating the LOcal Web (SLOW): I. Anomalies in the local density field