Testing homegeneity with Galaxy Star formation histories

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dc.contributor.authorHoyle, Ben
dc.contributor.authorJimenez, Raul
dc.contributor.authorMaartens, Roy
dc.contributor.authorHeavens, Alan
dc.contributor.authorClarkson, Chris
dc.contributor.authorTojeiro, Rita
dc.date.accessioned2017-07-24T09:33:33Z
dc.date.available2017-07-24T09:33:33Z
dc.date.issued2013
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%.en_US
dc.description.accreditationDepartment of HE and Training approved list
dc.identifier.citationHoyle, B. et al. (2013). Testing homegeneity with Galaxy Star formation histories. The Astrophysical Journal , 762 (L9): 1-5en_US
dc.identifier.issn2041-8205
dc.identifier.urihttp://hdl.handle.net/10566/3100
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.rightsPublisher retains copyright. Authors may archive the published version in their institutional repository.
dc.source.urihttp://dx.doi.org/10.1088/2041-8205/762/1/L9
dc.subjectCosmologyen_US
dc.subjectTheoryen_US
dc.subjectEarly universeen_US
dc.subjectLarge-scale structure of Universeen_US
dc.titleTesting homegeneity with Galaxy Star formation historiesen_US
dc.typeArticleen_US

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