Anti-lensing: the bright side of voids

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dc.contributor.authorBolejko, Krzysztof
dc.contributor.authorClarkson, Chris
dc.contributor.authorMaartens, Roy
dc.contributor.authorBacon, David
dc.contributor.authorMeures, Nikolai
dc.contributor.authorBeynon, Emma
dc.date.accessioned2018-02-06T10:39:35Z
dc.date.available2018-02-06T10:39:35Z
dc.date.issued2013
dc.description.abstractMore than half of the volume of our Universe is occupied by cosmic voids. The lensing magni ca- tion e ect from those under-dense regions is generally thought to give a small dimming contribution: objects on the far side of a void are supposed to be observed as slightly smaller than if the void were not there, which together with conservation of surface brightness implies net reduction in photons received. This is predicted by the usual weak lensing integral of the density contrast along the line of sight. We show that this standard e ect is swamped at low redshifts by a relativistic Doppler term that is typically neglected. Contrary to the usual expectation, objects on the far side of a void are brighter than they would be otherwise. Thus the local dynamics of matter in and near the void is crucial and is only captured by the full relativistic lensing convergence. There are also signi cant nonlinear corrections to the relativistic linear theory, which we show actually under-predicts the e ect. We use exact solutions to estimate that these can be more than 20% for deep voids. This remains an important source of systematic errors for weak lensing density reconstruction in galaxy surveys and for supernovae observations, and may be the cause of the reported extra scatter of eld supernovae located on the edge of voids compared to those in clusters.en_US
dc.description.accreditationWeb of Science
dc.identifier.citationBolejko, K. et al. (2013). Anti-lensing: the bright side of voids. Physical Review Letters, 110(2): 021302en_US
dc.identifier.issn0031-9007
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevLett.110.021302
dc.identifier.urihttp://hdl.handle.net/10566/3475
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherAmerican Physical Societyen_US
dc.rightsThis is the pre-print (from arXiv: 1209.3142v3) of the article that can be found online at: http://dx.doi.org/10.1103/PhysRevLett.110.021302
dc.status.ispeerreviewedTRUE
dc.subjectCosmic voidsen_US
dc.subjectLensing magnificationen_US
dc.subjectRelativistic linear theoryen_US
dc.subjectClustersen_US
dc.titleAnti-lensing: the bright side of voidsen_US
dc.typeArticleen_US

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