An emulator of 21cmFAST summaries, supporting three galaxy-formation models:
- ACG (v1; Breitman+23) — Atomic Cooling Galaxies (Pop II only). A 9-parameter emulator for the standard reionization scenario without mini-halos.
- radio (v2; Cang+24) — Radio Background. A 5-parameter emulator that adds a radio background sourced by molecular cooling (Pop III) stars on top of atomic cooling galaxies.
- MCG (v3; Breitman+26) — Molecular Cooling Galaxies. The most complete 11-parameter emulator, jointly modelling atomic and molecular cooling galaxies (Pop II + Pop III). Uniquely emulates the 2D cylindrical power spectrum P(k⊥, k∥) via a score-based diffusion model.
| Output | acg (v1) | radio (v2) | mcg (v3) |
|---|---|---|---|
| Global brightness temperature Tb | ✓ | ✓ | ✓ |
| Neutral fraction xHI | ✓ | ✓ | ✓ |
| Thomson optical depth τ | ✓ | ✓ | ✓ |
| IGM spin temperature Ts | ✓ | ✗ | ✓ |
| Radio temperature Tr | ✗ | ✓ | ✗ |
| 1D power spectrum P(k) | ✓ | ✓ | ✓ |
| 2D power spectrum P(k⊥, k∥) | ✗ | ✗ | ✓ |
| UV luminosity functions | ✓ | ✗ | ✓ |
See the documentation for tutorials and API.
If you encounter any problems, please file an issue along with a detailed description.
Contributions are very welcome. To learn more, see the Contributor Guide.
If you use 21cmEMU in your research, please cite Breitman+23. In particular, if you use 21cmEMUv2, also cite Cang+24.
If you use the newest mcg/v3 emulator, please also cite Breitman+26.
Distributed under the terms of the MIT license, 21cmEMU is free and open source software.