Quantifying the impact of baryon-CDM perturbations on halo clustering and baryon fraction
In: JCAP JCAP, 2021, 03, pp.023. ⟨10.1088/1475-7516/2021/03/023⟩ Journal of Cosmology and Astroparticle Physics; (2021)
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Zugriff:
Baryons and cold dark matter (CDM) did not comove prior to recombination. This leads to differences in the local baryon and CDM densities, the so-called baryon-CDM isocurvature perturbations $\delta_{bc}$. These perturbations are usually neglected in the analysis of Large-Scale Structure data but taking them into account might become important in the era of high precision cosmology. Using gravity-only 2-fluid simulations we assess the impact of such perturbations on the dark matter halos distribution. In particular, we focus on the baryon fraction in halos as a function of mass and large-scale $\delta_{bc}$, which also allows us to study details of the nontrivial numerical setup required for such simulations. We further measure the cross-power spectrum between the halo field and $\delta_{bc}$ over a wide range of mass. This cross-correlation is nonzero and negative which shows that halo formation is impacted by $\delta_{bc}$. We measure the associated bias parameter $b_{\delta_{bc}}$ and compare it to recent results, finding good agreement. Finally we quantify the impact of such perturbations on the halo-halo power spectrum and show that this effect can be degenerate with the one of massive neutrinos for surveys like DESI.
Comment: 27 pages, 11 figures, Version published in JCAP
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Quantifying the impact of baryon-CDM perturbations on halo clustering and baryon fraction
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Autor/in / Beteiligte Person: | Khoraminezhad, Hasti ; Angulo, Raul E. ; Lazeyras, Titouan ; Viel, Matteo ; Hahn, Oliver ; Joseph Louis LAGRANGE (LAGRANGE) ; Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
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Quelle: | JCAP JCAP, 2021, 03, pp.023. ⟨10.1088/1475-7516/2021/03/023⟩ Journal of Cosmology and Astroparticle Physics; (2021) |
Veröffentlichung: | HAL CCSD, 2021 |
Medientyp: | unknown |
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