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Salcido, J, McCarthy, IG, Kwan, J, Upadhye, A and Font, AS (2023) SP(k) - A hydrodynamical simulation-based model for the impact of baryon physics on the non-linear matter power spectrum. Monthly Notices of the Royal Astronomical Society, 523 (2). pp. 2247-22262. ISSN 0035-8711
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SP(k) - A hydrodynamical simulation-based model for the impact of baryon physics on the non-linear matter power spectrum.pdf - Published Version Available under License Creative Commons Attribution. Download (8MB) | Preview |
Abstract
Upcoming large-scale structure surveys will measure the matter power spectrum to approximately percent level accuracy with the aim of searching for evidence for new physics beyond the standard model of cosmology. In order to avoid biasing our conclusions, the theoretical predictions need to be at least as accurate as the measurements for a given choice of cosmological parameters. However, recent theoretical work has shown that complex physical processes associated with galaxy formation (particularly energetic feedback processes associated with stars and especially supermassive black holes) can alter the predictions by many times larger than the required accuracy. Here we present SP(k), a model for the effects of baryon physics on the non-linear matter power spectrum based on a new large suite of hydrodynamical simulations. Specifically, the ANTILLES suite consists of 400 simulations spanning a very wide range of the ‘feedback landscape’ and show that the effects of baryons on the matter power spectrum can be understood at approaching the percent level in terms of the mean baryon fraction of haloes, at scales of up to k ≲ 10h Mpc−1 and redshifts up to z = 3. For the range of scales and redshifts that will be probed by forthcoming cosmic shear measurements, most of the effects are driven by galaxy group-mass haloes (M ∼ 1013 − 14 M⊙). We present a simple Python implementation of our model, available at https://github.com/jemme07/pyspk, which can be used to incorporate baryon effects in standard gravity-only predictions, allowing for marginalisation over baryon physics within cosmological pipelines.
| Item Type: | Article |
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| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press (OUP) |
| SWORD Depositor: | A Symplectic |
| Date Deposited: | 15 Jun 2023 12:57 |
| Last Modified: | 15 Jun 2023 13:00 |
| DOI or ID number: | 10.1093/mnras/stad1474 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/19854 |
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