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Cluster-void degeneracy breaking: Modified gravity in the balance
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. The Johns Hopkins University, Department of Physics and Astronomy, 3400 North Charles Street, Baltimore, Maryland 21218, USA.ORCID iD: 0000-0003-0973-4804
Institut d’Astrophysique de Paris, 98 bis bd Arago, F-75014 Paris, France;AIM-Paris-Saclay, CEA/DSM/IRFU, CNRS, Université Paris 7, F-91191 Gif-sur-Yvette, France;BIPAC, University of Oxord, 1 Keble Road, Oxford OX1 3RH, United Kingdom.
2018 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 97, article id 103504Article in journal (Refereed) Published
Abstract [en]

Combining galaxy cluster and void abundances is a novel, powerful way to constrain deviations from general relativity and the Lambda CDM model. For a flat wCDM model with growth of large-scale structure parametrized by the redshift-dependent growth index gamma(z) = gamma(0) + gamma(1)z/(l + z) of linear matter perturbations, combining void and cluster abundances in future surveys with Euclid and the four-meter multiobject spectroscopic telescope could improve the figure of merit for (w, gamma(0),gamma(1)) by a factor of 20 compared to individual abundances. In an ideal case, improvement on current cosmological data is a figure of merit factor 600 or more.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, article id 103504
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-353455DOI: 10.1103/physrevd.97.103504ISI: 000432965300003OAI: oai:DiVA.org:uu-353455DiVA, id: diva2:1217368
Funder
Stiftelsen Olle Engkvist ByggmästareStiftelsen Längmanska kulturfondenHelge Ax:son Johnsons stiftelse EU, FP7, Seventh Framework Programme, 267117Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2018-09-26Bibliographically approved

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Sahlén, Martin

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