Null tests of the cosmological constant using supernovae

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dc.contributor.authorYahya, Sahba
dc.contributor.authorSeikel, Marina
dc.contributor.authorClarkson, Chris
dc.contributor.authorMaartens, Roy
dc.contributor.authorSmith, Mathew
dc.date.accessioned2016-10-12T15:07:47Z
dc.date.available2016-10-12T15:07:47Z
dc.date.issued2014
dc.description.abstractThe standard concordance model of the Universe is based on the cosmological constant as the driver of accelerating expansion. This concordance model is being subjected to a growing range of inter-locking observations. In addition to using generic observational tests, one can also design tests that target the specific properties of the cosmological constant. These null tests do not rely on parametrizations of observables, but focus on quantities that are constant only if dark energy is a cosmological constant. We use supernova data in null tests that are based on the luminosity distance. In order to extract derivatives of the distance in a model-independent way, we use Gaussian Processes. We find that the concordance model is compatible with the Union 2.1 data, but the error bars are fairly large. Simulated datasets are generated for the DES supernova survey and we show that this survey will allow for a sharper null test of the cosmological constant if we assume the Universe is flat. Allowing for spatial curvature degrades the power of the null test.en_US
dc.description.accreditationISIen_US
dc.identifier.citationYahya, S. et al. (2014). Null tests of the cosmological constant using supernovae. Physical Review. D, 89: 023503
dc.identifier.issn1550-7998
dc.identifier.urihttp://hdl.handle.net/10566/2449
dc.identifier.urihttps://doi.org/10.1103/PhysRevD.89.023503
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherAmerican Physical Society
dc.rightsThis is the author version of the article available online at: https://doi.org/10.1103/PhysRevD.89.023503
dc.source.urihttps://doi.org/10.1103/PhysRevD.89.023503
dc.status.ispeerreviewedTRUE
dc.subjectGaussian processesen_US
dc.subjectCosmologyen_US
dc.subjectSuper novaen_US
dc.titleNull tests of the cosmological constant using supernovaeen_US
dc.typeArticleen_US

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