Fast production of cosmological emulators in modified gravity: the matter power spectrum
| Autor: | Fiorini, Bartolomeo, Koyama, Kazuya, Baker, Tessa |
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| Rok vydání: | 2023 |
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| Druh dokumentu: | Working Paper |
| Popis: | We test the convergence of fast simulations based on the COmoving Lagrangian Acceleration (COLA) method for predictions of the matter power spectrum, specialising our analysis in the redshift range $1 \le z \le 1.65$, relevant to high-redshift spectroscopic galaxy surveys. We then focus on the enhancement of the matter power spectrum in modified gravity (MG), the boost factor, using the Dvali-Gabadadze-Porrati (DGP) theory as a test case but developing a general approach that can be applied to other MG theories. After identifying the minimal simulation requirements for accurate DGP boost factors, we design and produce a COLA simulation suite that we use to train a neural network emulator for the DGP boost factor. Using MG-AREPO simulations as a reference, we estimate the emulator accuracy to be of $\sim 3\%$ up to $k=5 \, h {\rm Mpc}^{-1}$ at $0 \leq z \leq 2$. We make the emulator publicly available at: https://github.com/BartolomeoF/nDGPemu. Comment: 24 pages, 17 figures, Comments are welcome - Accepted for publication in JCAP |
| Databáze: | arXiv |
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