Probing beyond-Horndeski gravity on ultra-large scales

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dc.contributor.authorDuniya, Didam G.A.
dc.contributor.authorMoloi, Teboho
dc.contributor.authorClarkson, Chris
dc.date.accessioned2021-02-18T11:31:16Z
dc.date.available2021-02-18T11:31:16Z
dc.date.issued2020
dc.description.abstractThe beyond-Horndeski gravity has recently been reformulated in the dark energy paradigm — which has been dubbed, Unified Dark Energy (UDE). The evolution equations for the given UDE appear to correspond to a non-conservative dark energy scenario, in which the total energy-momentum tensor is not conserved. We investigate both the background cosmology and, the large-scale imprint of the UDE by probing the angular power spectrum of galaxy number counts, on ultra-large scales; taking care to include the full relativistic corrections in the observed overdensity. The background evolution shows that only an effective mass smaller than the Planck mass is needed in the early universe in order for predictions in the given theory to match current observational constraints. We found that the effective mass-evolution-rate parameter, which drives the evolution of the UDE, acts to enhance the observed power spectrum and, hence, relativistic effects (on ultra-large scales) by enlarging the UDE sound horizon.en_US
dc.identifier.citationDuniya, D. G.A. et al. (2020). Probing beyond-Horndeski gravity on ultra-large scales. Journal of Cosmology and Astroparticle Physics, 2020(01)en_US
dc.identifier.urihttp://doi.org/10.1088/1475-7516/2020/01/033
dc.identifier.urihttp://hdl.handle.net/10566/5959
dc.language.isoenen_US
dc.publisherIOP Publishing Ltden_US
dc.subjectDark energy theoryen_US
dc.subjectGalaxy clusteringen_US
dc.subjectModified gravityen_US
dc.subjectPower spectrumen_US
dc.subjectHorndeski gravityen_US
dc.titleProbing beyond-Horndeski gravity on ultra-large scalesen_US
dc.typeArticleen_US

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