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dc.contributor.authorGarcía-Bellido, Juan-
dc.contributor.authorHaugboelle, Troels-
dc.date.accessioned2009-10-20T11:06:45Z-
dc.date.available2009-10-20T11:06:45Z-
dc.date.issued2009-09-22-
dc.identifier.citationJournal of cosmology and astroparticle physics 09(028): (2009)-
dc.identifier.issn1475-7516-
dc.identifier.urihttp://hdl.handle.net/10261/17830-
dc.description18 pages, 5 figures, 1 table.-- pre-print archive.-
dc.description.abstractAs an alternative explanation of the dimming of distant supernovae it has recently been advocated that we live in a special place in the Universe near the centre of a large spherical void described by a Lemaître-Tolman-Bondi (LTB) metric. In this scenario, the Universe is no longer homogeneous and isotropic, and the apparent late time acceleration is actually a consequence of spatial gradients. We propose in this paper a new observable, the normalized cosmic shear, written in terms of directly observable quantities, and calculable in arbitrary inhomogeneous cosmologies. This will allow future surveys to determine whether we live in a homogeneous universe or not. In this paper we also update our previous observational constraints from geometrical measures of the background cosmology. We include the Union Supernovae data set of 307 Type Ia supernovae, the CMB acoustic scale and the first measurement of the radial baryon acoustic oscillation scale. Even though the new data sets are significantly more constraining, LTB models—albeit with slightly larger voids—are still in agreement with observations, at χ2/d.o.f. = 309.1/(310−4) = 1.01. Together with the paper we also publish the updated easyLTB code used for calculating the models and for comparing them to the observations.en_US
dc.description.sponsorshipWe thank James Zibin, Tirthabir Biswas, and Alesio Notari for interesting discussions. We acknowledge the use of the computer resources at the Danish Centre of Scientific Computing. We also acknowledge financial support from the Spanish Research Ministry, under contract FPA2006-05807 and the Consolider Ingenio 2010 programme under contract CSD2007-00060 “Physics of the Accelerating Universe” (PAU).en_US
dc.format.extent640072 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.publisherInstitute of Physics Publishing-
dc.publisherInternational School for Advanced Studies-
dc.rightsopenAccessen_US
dc.subjectDark energy theoryen_US
dc.subjectClassical tests of cosmologyen_US
dc.subjectSuperclusters and voidsen_US
dc.titleThe radial BAO scale and Cosmic Shear, a new observable for Inhomogeneous Cosmologiesen_US
dc.typeArtículoen_US
dc.identifier.doi10.1088/1475-7516/2009/09/028-
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/10.1088/1475-7516/2009/09/028en_US
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