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.accessioned2021-10-08T07:11:33Z
dc.date.available2021-10-08T07:11:33Z
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.
dc.identifier.apacitationYahya, S., Seikel, M., Clarkson, C., Maartens, R., & Smith, M. (2014). Null tests of the cosmological constant using supernovae. <i>Physical Review D - Particles, Fields, Gravitation, and Cosmology</i>, 89(2), 174 - 177. http://hdl.handle.net/11427/34637en_ZA
dc.identifier.chicagocitationYahya, Sahba, Marina Seikel, Chris Clarkson, Roy Maartens, and Mathew Smith "Null tests of the cosmological constant using supernovae." <i>Physical Review D - Particles, Fields, Gravitation, and Cosmology</i> 89, 2. (2014): 174 - 177. http://hdl.handle.net/11427/34637en_ZA
dc.identifier.citationYahya, S., Seikel, M., Clarkson, C., Maartens, R. & Smith, M. 2014. Null tests of the cosmological constant using supernovae. <i>Physical Review D - Particles, Fields, Gravitation, and Cosmology.</i> 89(2):174 - 177. http://hdl.handle.net/11427/34637en_ZA
dc.identifier.issn1550-2368
dc.identifier.issn1550-7998
dc.identifier.ris TY - Journal Article AU - Yahya, Sahba AU - Seikel, Marina AU - Clarkson, Chris AU - Maartens, Roy AU - Smith, Mathew AB - The 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. DA - 2014 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - Physical Review D - Particles, Fields, Gravitation, and Cosmology LK - https://open.uct.ac.za PY - 2014 SM - 1550-2368 SM - 1550-7998 T1 - Null tests of the cosmological constant using supernovae TI - Null tests of the cosmological constant using supernovae UR - http://hdl.handle.net/11427/34637 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34637
dc.identifier.vancouvercitationYahya S, Seikel M, Clarkson C, Maartens R, Smith M. Null tests of the cosmological constant using supernovae. Physical Review D - Particles, Fields, Gravitation, and Cosmology. 2014;89(2):174 - 177. http://hdl.handle.net/11427/34637.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematics
dc.publisher.facultyFaculty of Science
dc.sourcePhysical Review D - Particles, Fields, Gravitation, and Cosmology
dc.source.journalissue2
dc.source.journalvolume89
dc.source.pagination174 - 177
dc.source.urihttps://dx.doi.org/10.1103/PhysRevD.89.023503
dc.subject.otherGaussian processes
dc.subject.otherCosmology
dc.subject.otherSuper nova
dc.subject.otherArticle
dc.titleNull tests of the cosmological constant using supernovae
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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