An N-body code for non-periodic dark matter cosmological simulations
We present a novel N-body simulation method that compactifies the infinite spatial extent of the Universe into a finite sphere with isotropic boundary conditions to follow the evolution of the large-scale structure. Our approach eliminates the need for periodic boundary conditions, a mere numerical convenience which is not supported by observation and which modifies the law of force on large scales in an unrealistic fashion. With this code, it is possible to simulate an infinite universe with unprecedented dynamic range for a given amount of memory, and in contrast of the traditional periodic simulations, its fundamental geometry and topology match observations. We present here the Multi-GPU realization of this algorithm with MPI-OpenMP-CUDA hybrid parallelisation.
This code is under development.
For more information see: astro-ph and astro-ph
If you plan to publish an academic paper using this software, please consider citing the following publication:
G. Rácz, I. Szapudi, I. Csabai, L. Dobos, "Compactified Cosmological Simulations of the Infinite Universe": MNRAS, Volume 477, Issue 2, p.1949-1957