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    A null test to probe the scale dependence of the growth of structure as a test of general relativity 
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    A null test to probe the scale dependence of the growth of structure as a test of general relativity

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    Published version (516.6Kb)
    Volume
    492
    Pagination
    L34 - L39
    Publisher
    Wiley-Blackwell
    DOI
    10.1093/mnrasl/slz175
    Journal
    Monthly Notices of the Royal Astronomical Society: Letters
    Issue
    1
    ISSN
    1745-3925
    Metadata
    Show full item record
    Abstract
    The main science driver for the coming generation of cosmological surveys is understanding dark energy that relies on testing general relativity on the largest scales. Once we move beyond the simplest explanation for dark energy of a cosmological constant, the space of possible theories becomes both vast and extremely hard to compute realistic observables. A key discriminator of a cosmological constant, however, is that the growth of structure is scale invariant on large scales. By carefully weighting observables derived from distributions of galaxies and a dipole pattern in their apparent sizes, we construct a null test that vanishes for any model of gravity or dark energy where the growth of structure is scale independent. It relies only on very few assumptions about cosmology, and does not require any modelling of the growth of structure. We show that with a survey like the Dark Energy Spectroscopic Instrument (DESI) a scale dependence of the order of 10–20 per cent can be detected at 3σ with the null test, which will drop by a factor of 2 for a survey like the Square Kilometre Array. We also show that the null test is very insensitive to typical uncertainties in other cosmological parameters including massive neutrinos and scale-dependent bias, making this a key null test for dark energy.
    Authors
    Franco, FO; Bonvin, C; Clarkson, C
    URI
    https://qmro.qmul.ac.uk/xmlui/handle/123456789/62718
    Collections
    • Physics and Astronomy [970]
    Language
    en
    Licence information
    This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
    Copyright statements
    © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
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