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Imprints of non-standard dark energy and dark matter models on the 21 cm intensity map power spectrum

Carucci, IP; Corasaniti, P-S; Viel, M; (2017) Imprints of non-standard dark energy and dark matter models on the 21 cm intensity map power spectrum. Journal of Cosmology and Astroparticle Physics , 2017 (12) , Article 018. 10.1088/1475-7516/2017/12/018. Green open access

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Abstract

We study the imprint of non-standard dark energy (DE) and dark matter (DM) models on the 21cm intensity map power spectra from high-redshift neutral hydrogen (HI) gas. To this purpose we use halo catalogs from N-body simulations of dynamical DE models and DM scenarios which are as successful as the standard Cold Dark Matter model with Cosmological Constant (ΛCDM) at interpreting available cosmological observations. We limit our analysis to halo catalogs at redshift z=1 and 2.3 which are common to all simulations. For each catalog we model the HI distribution by using a simple prescription to associate the HI gas mass to N-body halos. We find that the DE models leave a distinct signature on the HI spectra across a wide range of scales, which correlates with differences in the halo mass function and the onset of the non-linear regime of clustering. In the case of the non-standard DM model significant differences of the HI spectra with respect to the ΛCDM model only arise from the suppressed abundance of low mass halos. These cosmological model dependent features also appear in the 21cm spectra. In particular, we find that future SKA measurements can distinguish the imprints of DE and DM models at high statistical significance.

Type: Article
Title: Imprints of non-standard dark energy and dark matter models on the 21 cm intensity map power spectrum
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1475-7516/2017/12/018
Publisher version: https://doi.org/10.1088/1475-7516/2017/12/018
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, dark matter simulations, dark energy experiments, power spectrum, cosmological parameters from LSS, COSMIC STRUCTURE FORMATION, COSMOLOGICAL CONSTANT, NEUTRAL HYDROGEN, SIMULATIONS, UNIVERSE, PROBE, REIONIZATION, TIME
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10049809
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