The impact of constrained interacting dark energy on the bound-zone velocity profile
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929502941085696 |
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| author | Lee, Jounghun Baldi, Marco |
| author_facet | Lee, Jounghun Baldi, Marco |
| contents | We numerically study the effects of constrained interacting dark energy (CIDER) on the bound-zone velocity profiles around massive dark matter halos. Analyzing the CIDER simulations performed by Baldi (2023) for three different cases of dark sector coupling ($β=0.03$, $0.05$ and $0.08$) as well as for the standard $Λ$CDM cosmology ($β=0$), we determine the mean peculiar velocity profiles in the bound zones around the friends-of-friends halos with masses larger than $M_{\rm cut}=3\times 10^{13}\,h^{-1}M_{\odot}$ at three redshifts, $z=0$, $0.5$ and $1$. It is found that the universal power-law formula proposed by Falco et al. (2024) originally for the $Λ$CDM case still describes well the bound-zone velocity profiles, $V(r)$, even in the CIDER models. The slope of $V(r)$, turns out to be significantly affected by the CIDER, progressively decreasing as $β$ increases. Meanwhile, the amplitude of $V(r)$ exhibits little dependence on $β$, which is ascribed to the identical Hubble parameters shared by the $Λ$CDM and CIDER models in the entire redshift range. Our results imply that the bound-zone velocity slope can break a degeneracy even between the $Λ$CDM and CIDER models with $β\le 0.03$, which the standard cosmological diagnostics fail to distinguish. We devise a simple analytic formula for the bound-zone slope as a function of $β$, and prove its validity at all of the three redshifts. It is concluded that the slope of the mean bound-zone peculiar velocity profile should be in principle a powerful probe of dark sector interaction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_18210 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The impact of constrained interacting dark energy on the bound-zone velocity profile Lee, Jounghun Baldi, Marco Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies We numerically study the effects of constrained interacting dark energy (CIDER) on the bound-zone velocity profiles around massive dark matter halos. Analyzing the CIDER simulations performed by Baldi (2023) for three different cases of dark sector coupling ($β=0.03$, $0.05$ and $0.08$) as well as for the standard $Λ$CDM cosmology ($β=0$), we determine the mean peculiar velocity profiles in the bound zones around the friends-of-friends halos with masses larger than $M_{\rm cut}=3\times 10^{13}\,h^{-1}M_{\odot}$ at three redshifts, $z=0$, $0.5$ and $1$. It is found that the universal power-law formula proposed by Falco et al. (2024) originally for the $Λ$CDM case still describes well the bound-zone velocity profiles, $V(r)$, even in the CIDER models. The slope of $V(r)$, turns out to be significantly affected by the CIDER, progressively decreasing as $β$ increases. Meanwhile, the amplitude of $V(r)$ exhibits little dependence on $β$, which is ascribed to the identical Hubble parameters shared by the $Λ$CDM and CIDER models in the entire redshift range. Our results imply that the bound-zone velocity slope can break a degeneracy even between the $Λ$CDM and CIDER models with $β\le 0.03$, which the standard cosmological diagnostics fail to distinguish. We devise a simple analytic formula for the bound-zone slope as a function of $β$, and prove its validity at all of the three redshifts. It is concluded that the slope of the mean bound-zone peculiar velocity profile should be in principle a powerful probe of dark sector interaction. |
| title | The impact of constrained interacting dark energy on the bound-zone velocity profile |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.18210 |