Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle

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dc.contributor.authorFebruary, Sean
dc.contributor.authorClarkson, Chris
dc.contributor.authorMaartens, Roy
dc.date.accessioned2018-02-15T13:46:24Z
dc.date.available2018-02-15T13:46:24Z
dc.date.issued2013
dc.description.abstractA suggested solution to the dark energy problem is the void model, where accelerated expansion is replaced by Hubble-scale inhomogeneity. In these models, density perturbations grow on a radially inhomogeneous background. This large scale inhomogeneity distorts the spherical Baryon Acoustic Oscillation feature into an ellipsoid which implies that the bump in the galaxy correlation function occurs at different scales in the radial and transverse correlation functions. We compute these for the first time, under the approximation that curvature gradients do not couple the scalar modes to vector and tensor modes. The radial and transverse correlation functions are very different from those of the concordance model, even when the models have the same average BAO scale. This implies that if void models are fine-tuned to satisfy average BAO data, there is enough extra information in the correlation functions to distinguish a void model from the concordance model. We expect these new features to remain when the full perturbation equations are solved, which means that the radial and transverse galaxy correlation functions can be used as a powerful test of the Copernican Principle.en_US
dc.description.accreditationWeb of Science
dc.identifier.citationFebruary, S. et al. (2013). Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle. Journal of Cosmology and Astroparticle Physics, 23en_US
dc.identifier.issn1475-7516
dc.identifier.urihttp://dx.doi.org/10.1088/1475-7516/2013/03/023
dc.identifier.urihttp://hdl.handle.net/10566/3499
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherIOP Scienceen_US
dc.rightsThis is the pre-print (From arXiv:1206.1602) of the article available online at: http://dx.doi.org/10.1088/1475-7516/2013/03/023
dc.status.ispeerreviewedTRUE
dc.subjectGalaxiesen_US
dc.subjectBAOen_US
dc.subjectBaryon Acoustic Oscillationen_US
dc.subjectCopernican Principleen_US
dc.titleGalaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principleen_US
dc.typeArticleen_US

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