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dc.contributor.authorHoyle, Ben
dc.contributor.authorTojeiro, Rita
dc.contributor.authorJimenez, Raul
dc.contributor.authorHeavens, Alan
dc.contributor.authorClarkson, Chris
dc.contributor.authorMaartens, Roy
dc.identifier.citationHoyle , B , Tojeiro , R , Jimenez , R , Heavens , A , Clarkson , C & Maartens , R 2012 , ' Testing homogeneity with galaxy star formation histories ' , Astrophysical Journal Letters , vol. 762 , no. 1 , L9 .
dc.identifier.otherPURE: 171423390
dc.identifier.otherPURE UUID: 696a1936-927f-4938-9d7c-2e9c6b0b5021
dc.identifier.otherBibCode: 2013ApJ...762L...9H
dc.identifier.otherScopus: 84873333558
dc.description.abstractObservationally confirming spatial homogeneity on sufficiently large cosmological scales is of importance to test one of the underpinning assumptions of cosmology, and is also imperative for correctly interpreting dark energy. A challenging aspect of this is that homogeneity must be probed inside our past light cone, while observations take place on the light cone. The star formation history (SFH) in the galaxy fossil record provides a novel way to do this. We calculate the SFH of stacked luminous red galaxy (LRG) spectra obtained from the Sloan Digital Sky Survey. We divide the LRG sample into 12 equal-area contiguous sky patches and 10 redshift slices (0.2 < z < 0.5), which correspond to 120 blocks of volume ~0.04 Gpc3. Using the SFH in a time period that samples the history of the universe between look-back times 11.5 and 13.4 Gyr as a proxy for homogeneity, we calculate the posterior distribution for the excess large-scale variance due to inhomogeneity, and find that the most likely solution is no extra variance at all. At 95% credibility, there is no evidence of deviations larger than 5.8%.
dc.relation.ispartofAstrophysical Journal Lettersen
dc.rightsCopyright © 2013. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at:
dc.subjectCosmology: theoryen
dc.subjectEarly universeen
dc.subjectLarge-scale structure of Universeen
dc.subjectQB Astronomyen
dc.titleTesting homogeneity with galaxy star formation historiesen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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