Simulating cosmic structure formation with the GADGET-4 code

Understand

Numerical methods have become a powerful tool for research in astrophysics, but their utility depends critically on the availability of suitable simulation codes.

• This calls for continuous efforts in code development, which is necessitated also by the rapidly evolving technology underlying today's computing hardware.
• Here we discuss recent methodological progress in the GADGET code, which has been widely applied in cosmic structure formation over the past two decades.
• The new version offers improvements in force accuracy, in time-stepping, in adaptivity to a large dynamic range in timescales, in computational efficiency, and in parallel scalability through a special MPI/shared-memory parallelization and communication strategy, and a more-sophisticated domain decomposition algorithm.