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- W4387560403 abstract "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." @default.
- W4387560403 created "2023-10-12" @default.
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- W4387560403 date "2023-10-09" @default.
- W4387560403 modified "2023-10-18" @default.
- W4387560403 title "Fast production of cosmological emulators in modified gravity: the matter power spectrum" @default.
- W4387560403 doi "https://doi.org/10.48550/arxiv.2310.05786" @default.
- W4387560403 hasPublicationYear "2023" @default.
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