21cmFAST
21cmFAST is a public, "semi-numerical" simulation code to efficiently and accurately compute large-scale cosmological fields during the first billion years. Originally conceived by Mesinger & Furlanetto (2007) and Mesinger, Furlanetto, and Cen (2011), it is under continuous development by the 21cmFAST collaboration. It uses a combination of perturbation theory, Lagrangian + merger tree halo finding and approximate cosmological radiative transfer to compute 3D realizations and lightcones of galaxy fields, associated radiation fields, and the intergalactic medium (IGM). It is extremely efficient (~1 core hour for a typical run), allowing the user to sample a wide parameter space of astrophysical and cosmological uncertainties, while maintaining accuracy at the moderate to large scales probed by most observations. As such, it is being used by researchers in over ~30 countries to interpret diverse datasets, including the Lyman alpha forest, UV luminosity functions, Lyman alpha emitter clustering and number evolution, CMB primary and secondary anisotropies caused by the EoR, Lyman alpha damping wings in quasar and galaxy spectra, the cosmic 21cm signal, etc.
Related media:
Varying galaxy parameters
Varying galaxy parameters
Galaxy and 21cm lightcone
21cm slice and PS evolution
IGM properties and Lya forest
Forward-modeling
Map of known 21cm users
"Bright galaxy" 21cm LC
"Faint galaxy" 21cm LC
