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A high-redshift test of gravity using enhanced growth of small structures probed by the neutral hydrogen distribution.

Leo, Matteo and Arnold, Christian and Li, Baojiu (2019) 'A high-redshift test of gravity using enhanced growth of small structures probed by the neutral hydrogen distribution.', Physical review D., 100 (6). 064044.

Abstract

Future 21-cm intensity mapping surveys such as SKA can provide precise information on the spatial distribution of the neutral hydrogen (HI) in the postreionization epoch. This information will allow us to test the standard Λ cold dark matter paradigm and with that the nature of gravity. In this work, we employ the SHYBONE simulations, which model galaxy formation in fðRÞ modified gravity using the IllustrisTNG model, to study the effects of modified gravity on HI abundance and power spectra. We find that the enhanced growth low-mass dark matter halos experience in fðRÞ gravity at high redshifts alters the HI power spectrum and can be observable through 21-cm intensity mapping. Our results suggest that the HI power spectrum is suppressed by ∼13% on scales k ≲ 2h Mpc−1 at z ¼ 2 for F6, a fðRÞ model which passes most observational constraints. We show that this suppression can be detectable by SKA1-MID with 1000 hours of exposure time, making HI clustering a novel test of gravity at high redshift.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://link.aps.org/doi/10.1103/PhysRevD.100.064044
Publisher statement:Reprinted with permission from the American Physical Society: Leo, Matteo, Arnold, Christian & Li, Baojiu (2019). A high-redshift test of gravity using enhanced growth of small structures probed by the neutral hydrogen distribution. Physical Review D 100: 064044. © 2019 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:29 August 2019
Date deposited:24 September 2019
Date of first online publication:23 September 2019
Date first made open access:24 September 2019

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