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The WiggleZ Dark Energy Survey: measuring the cosmic expansion history using the Alcock-Paczynski test and distant supernovae

Blake, Chris; Glazebrook, Karl; Davis, Tamara; Brough, Sarah; Colless, Matthew; Contreras, Carlos; Couch, Warrick; Croom, Scott M; Drinkwater, Michael John; Forster, Karl; Gilbank, David; Pracy, Michael; Sharp, Robert

Description

Astronomical observations suggest that today's Universe is dominated by a dark energy of unknown physical origin. One of the most notable results obtained from many models is that dark energy should cause the expansion of the Universe to accelerate: but the expansion rate as a function of time has proved very difficult to measure directly. We present a new determination of the cosmic expansion history by combining distant supernovae observations with a geometrical analysis of large-scale galaxy...[Show more]

dc.contributor.authorBlake, Chris
dc.contributor.authorGlazebrook, Karl
dc.contributor.authorDavis, Tamara
dc.contributor.authorBrough, Sarah
dc.contributor.authorColless, Matthew
dc.contributor.authorContreras, Carlos
dc.contributor.authorCouch, Warrick
dc.contributor.authorCroom, Scott M
dc.contributor.authorDrinkwater, Michael John
dc.contributor.authorForster, Karl
dc.contributor.authorGilbank, David
dc.contributor.authorPracy, Michael
dc.contributor.authorSharp, Robert
dc.date.accessioned2015-12-10T22:17:05Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/51245
dc.description.abstractAstronomical observations suggest that today's Universe is dominated by a dark energy of unknown physical origin. One of the most notable results obtained from many models is that dark energy should cause the expansion of the Universe to accelerate: but the expansion rate as a function of time has proved very difficult to measure directly. We present a new determination of the cosmic expansion history by combining distant supernovae observations with a geometrical analysis of large-scale galaxy clustering within the WiggleZ Dark Energy Survey, using the Alcock-Paczynski test to measure the distortion of standard spheres. Our result constitutes a robust and non-parametric measurement of the Hubble expansion rate as a function of time, which we measure with 10-15 per cent precision in four bins within the redshift range 0.1 < z < 0.9. We demonstrate, in a manner insensitive to the assumed cosmological model, that the cosmic expansion is accelerating. Furthermore, we find that this expansion history is consistent with a cosmological-constant dark energy.
dc.publisherBlackwell Publishing Ltd
dc.rightsAuthor/s retain copyright
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: Dark energy; Distance scale; Surveys
dc.titleThe WiggleZ Dark Energy Survey: measuring the cosmic expansion history using the Alcock-Paczynski test and distant supernovae
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume418
dc.date.issued2011
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationu3356449xPUB220
local.identifier.ariespublicationu4630950xPUB85
local.type.statusPublished Version
local.contributor.affiliationBlake, Chris, Swinburne University of Technology
local.contributor.affiliationGlazebrook, Karl, Swinburne University of Technology
local.contributor.affiliationDavis, Tamara, University of Queensland
local.contributor.affiliationBrough, Sarah, Australian Astronomical Observatory
local.contributor.affiliationColless, Matthew, Anglo-Australian Observatory
local.contributor.affiliationContreras, Carlos, Swinburne University of Technology
local.contributor.affiliationCouch, Warrick, Swinburne University of Technology
local.contributor.affiliationCroom, Scott M, University of Sydney
local.contributor.affiliationDrinkwater, Michael John, University of Queensland
local.contributor.affiliationForster, Karl, California Institute of Technology
local.contributor.affiliationGilbank, David, University of Waterloo
local.contributor.affiliationPracy, Michael, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSharp, Robert, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage1725
local.bibliographicCitation.lastpage1735
local.identifier.doi10.1111/j.1365-2966.2011.19606.x
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2016-02-24T09:54:30Z
local.identifier.scopusID2-s2.0-83055194309
local.identifier.thomsonID000298088000020
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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