Dark matter halo sparsity of modified gravity scenarios

Pier Stefano Corasaniti, Carlo Giocoli, and Marco Baldi
Phys. Rev. D 102, 043501 – Published 3 August 2020

Abstract

Modified gravity (MG) scenarios have been advocated to account for the dark energy phenomenon in the universe. These models predict departures from general relativity on large cosmic scales that can be tested through a variety of probes such as observations of galaxy clusters among others. Here, we investigate the imprint of MG models on the internal mass distribution of clusterlike halos as probed by the dark matter halo sparsity. To this purpose we perform a comparative analysis of the properties of the halo sparsity using N-body simulation halo catalogs of a standard flat ΛCDM model and MG scenarios from the DUSTGRAIN-pathfinder simulation suite. We find that the onset of the screening mechanism leaves a distinct signature in the redshift evolution of the ensemble average halos sparsity. Measurements of the sparsity of galaxy clusters from currently available mass estimates are unable to test MG models due to the large uncertainties on the cluster masses. We show that this should be possible in the future provided large cluster samples with cluster masses determined to better than 30% accuracy level.

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  • Received 1 June 2020
  • Accepted 22 July 2020

DOI:https://doi.org/10.1103/PhysRevD.102.043501

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Pier Stefano Corasaniti1,2,*, Carlo Giocoli3,4,5, and Marco Baldi3,4,5

  • 1LUTH, UMR 8102 CNRS, Observatoire de Paris, PSL Research University, Université Paris Diderot, 5 place Jules Janssen, 92195 Meudon, France
  • 2Sorbonne Université, CNRS, UMR 7095, Institut d’Astrophysique de Paris, 98 bis bd Arago, 75014 Paris, France
  • 3Dipartimento di Fisica e Astronomia, Alma Mater Studiorum Universit‘a di Bologna, via Gobetti 93/2, I-40129 Bologna, Italy
  • 4INAF, Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, via Gobetti 93/3, I-40129 Bologna, Italy
  • 5INFN, Sezione di Bologna, viale Berti Pichat 6/2, I-40127 Bologna, Italy

  • *Pier-Stefano.Corasaniti@obspm.fr

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Issue

Vol. 102, Iss. 4 — 15 August 2020

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