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dc.contributor.authorYennapureddy, Manoj K.
dc.contributor.authorMelia, Fulvio
dc.date.accessioned2018-05-01T23:56:10Z
dc.date.available2018-05-01T23:56:10Z
dc.date.issued2018-03-24
dc.identifier.citationYennapureddy, M.K. & Melia, F. Eur. Phys. J. C (2018) 78: 258. https://doi.org/10.1140/epjc/s10052-018-5746-8en_US
dc.identifier.issn1434-6044
dc.identifier.issn1434-6052
dc.identifier.doi10.1140/epjc/s10052-018-5746-8
dc.identifier.urihttp://hdl.handle.net/10150/627542
dc.description.abstractStrong gravitational lenses provide source/lens distance ratios D-obs useful in cosmological tests. Previously, a catalog of 69 such systems was used in a one-on-one comparison between the standard model, Lambda CDM, and the R-h = ct universe, which has thus far been favored by the application of model selection tools to many other kinds of data. But in that work, the use of model parametric fits to the observations could not easily distinguish between these two cosmologies, in part due to the limited measurement precision. Here, we instead use recently developed methods based on Gaussian Processes (GP), in which D-obs may be reconstructed directly from the data without assuming any parametric form. This approach not only smooths out the reconstructed function representing the data, but also reduces the size of the 1 sigma confidence regions, thereby providing greater power to discern between different models. With the current sample size, we show that analyzing strong lenses with a GP approach can definitely improve the model comparisons, producing probability differences in the range similar to 10-30%. These results are still marginal, however, given the relatively small sample. Nonetheless, we conclude that the probability of R-h = ct being the correct cosmology is somewhat higher than that of Lambda CDM, with a degree of significance that grows with the number of sources in the subsamples we consider. Future surveys will significantly grow the catalog of strong lenses and will therefore benefit considerably from the GP method we describe here. In addition, we point out that if the R-h = ct universe is eventually shown to be the correct cosmology, the lack of free parameters in the study of strong lenses should provide a remarkably powerful tool for uncovering the mass structure in lensing galaxies.en_US
dc.description.sponsorshipChinese Academy of Sciences Visiting Professorships for Senior International Scientists [2012T1J0011]; Chinese State Administration of Foreign Experts Affairs [GDJ20120491013]en_US
dc.language.isoenen_US
dc.publisherSPRINGERen_US
dc.relation.urlhttp://link.springer.com/10.1140/epjc/s10052-018-5746-8en_US
dc.rights© The Author(s) 2018. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License.en_US
dc.titleCosmological tests with strong gravitational lenses using Gaussian processesen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Physen_US
dc.contributor.departmentUniv Arizona, Dept Phys, Program Appl Mathen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.identifier.journalEUROPEAN PHYSICAL JOURNAL Cen_US
dc.description.noteOpen access journal.en_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe European Physical Journal C
dc.source.volume78
dc.source.issue3
refterms.dateFOA2018-05-01T23:56:11Z


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