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A Multi-Fidelity Emulator for the Lyman-$\alpha$ Forest Flux Power Spectrum
- Source :
- MNRAS 517, 3, 3200 (2022)
- Publication Year :
- 2022
-
Abstract
- In this work we extend our recently developed multi-fidelity emulation technique to the simulated Lyman-$\alpha$ forest flux power spectrum. Multi-fidelity emulation allows interpolation of simulation outputs between cosmological parameters using many cheap low-fidelity simulations and a few expensive high-fidelity simulations. Using a test suite of small box (30 Mpc/h) simulations, we show that multi-fidelity emulation is able to reproduce the Lyman-$\alpha$ forest flux power spectrum well, achieving an average accuracy when compared to a test suite of $0.8\%$. We further show that it has a substantially increased accuracy over single-fidelity emulators, constructed using either the high or low-fidelity simulations only. In particular, it allows the extension of an existing simulation suite to smaller scales and higher redshifts.<br />Comment: 12 pages, 10 figures
- Subjects :
- Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Database :
- arXiv
- Journal :
- MNRAS 517, 3, 3200 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2207.06445
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1093/mnras/stac2435