Clustering of quintessence on horizon scales and its imprint on HI intensity mapping

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dc.contributor.authorDuniya, Didam G.A.
dc.contributor.authorBertacca, Daniele
dc.contributor.authorMaartens, Roy
dc.date.accessioned2018-02-06T11:11:40Z
dc.date.available2018-02-06T11:11:40Z
dc.date.issued2013
dc.description.abstractQuintessence can cluster only on horizon scales. What is the effect on the observed matter distribution? To answer this, we need a relativistic approach that goes beyond the standard Newtonian calculation and deals properly with large scales. Such an approach has recently been developed for the case when dark energy is vacuum energy, which does not cluster at all. We extend this relativistic analysis to deal with dynamical dark energy. Using three quintessence potentials as examples, we compute the angular power spectrum for the case of an HI intensity map survey. Compared to the concordance model with the same small-scale power at z = 0, quintessence boosts the angular power by up to 15% at high redshifts, while power in the two models converges at low redshifts. The difference is mainly due to the background evolution, driven mostly by the normalization of the power spectrum today. The dark energy perturbations make only a small contribution on the largest scales, and a negligible contribution on smaller scales. Ironically, the dark energy perturbations remove the false boost of large-scale power that arises if we impose the (unphysical) assumption that the dark energy is smooth.en_US
dc.description.accreditationWeb of Science
dc.identifier.citationDuniya, D.G.A. et al. (2013). Clustering of quintessence on horizon scales and its imprint on HI intensity mapping. Journal of Cosmology and Astroparticle Physics, 10en_US
dc.identifier.issn1475-7516
dc.identifier.urihttp://dx.doi.org/10.1088/1475-7516/2013/10/015
dc.identifier.urihttp://hdl.handle.net/10566/3476
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherIOP Scienceen_US
dc.rightsThis is the pre-print version (From arXiv: 1305.4509v5) of the article published online at: http://dx.doi.org/10.1088/1475-7516/2013/10/015
dc.status.ispeerreviewedTRUE
dc.subjectQuintessenceen_US
dc.subjectHorizon scalesen_US
dc.subjectHI intensity mappingen_US
dc.subjectDark energy perturbationsen_US
dc.titleClustering of quintessence on horizon scales and its imprint on HI intensity mappingen_US
dc.typeArticleen_US

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