The Tiamat Simulation Suite

Overview

Tiamat is a high-redshift N-body simulation suite that tracks the rapid build-up of early galaxies with enough temporal resolution to follow individual haloes as they grow, merge, and reshape the Epoch of Reionization (EoR). It combines a cosmologically meaningful volume with fine-grained time sampling to capture early galaxy assembly and produce accurate merger trees.

100 snapshots z=35-5 ~10-11 Myr cadence 100 Mpc box Planck-2015 cosmology

Why it matters: dense time sampling keeps merger trees physically meaningful during the fastest epoch of galaxy growth, where long snapshot gaps can fail to capture the growth of structure powering galaxy formation.

  • Cosmologically meaningful volume with resolution tuned to the low-mass galaxies that drive reionization.
  • Time-dense outputs enable robust halo merger histories during the most dynamical epoch.
  • Designed to anchor early-Universe galaxy/IGM modeling for the DRAGONS program.

Key Results

Concise summaries of flagship Tiamat results, with details in the papers below.

  • Only a minority (~20%) of haloes are dynamically relaxed during reionization, highlighting a violent growth phase.
  • Recovery after formation or mergers takes about 1.5-2 dynamical times and is largely mass-independent.
  • Major mergers leave long-lived phase-space structures, which can bias inferred halo growth if not handled carefully.

The following provides links to publications presenting the Tiamat simulation suite and scientific results and images & movies highlighting the range of environments captured by Tiamat near the end of the EoR.

Selected Publications

Peer-reviewed work that introduces the suite and its early scientific results.

Selected Movies

Animated views of a range of Tiamat environments at the end of the Epoch of Reionization, plus one sequence illustrating the growth of structure from z=50 to z=5.

Selected Still Images

Stills of the environments animated in the movie section.