Pantheon update on a model-independent analysis of cosmological supernova data

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dc.contributor.authorÇamlıbel, Ali Kazım
dc.contributor.authorSemiz, İbrahim
dc.contributor.authorFeyizoğlu, M. Akif
dc.date.accessioned2021-01-08T21:51:19Z
dc.date.available2021-01-08T21:51:19Z
dc.date.issued2020
dc.departmentTAÜ, Mühendislik Fakültesi, Elektrik-Elektronik Mühendisliği Bölümüen_US
dc.descriptionCamlibel, A. Kazim/0000-0003-0060-7809;en_US
dc.descriptionWOS:000584941200001en_US
dc.description.abstractWe present an update of our previous work, necessitated by availability of a significantly improved dataset. The work is a model-independent analysis of the cosmological supernova (type Ia) data, where function families are fit to the data in form of luminosity distance as function of redshift, that is, d(L)(z); and subsequently time-derivatives of the scale function a(t) are analytically derived, but as functions of z, without making assumptions about the theory of gravity or the contents of the Universe. This gives, e.g. the redshift value at which the Universe goes over from deceleration to acceleration, as z = 0.54 +/- 0.04 for a flat Universe. In the update, we switch to a more modern fit criterion and also take into account the uncertainty in the calibration of the SNIa luminosities. If a theory of gravity is assumed, our results allow determination of the density of the Universe as function of z, from which conclusions about the contents of the Universe can be drawn. We update the previous work's result where this was done for Einstein gravity, finding a lower-limit on the dark energy (DE) fraction, omega(DE) > 0.46; and here we do this also for Starobinsky gravity, where we can find a Starobinsky parameter that can eliminate the need for DE.
dc.identifier.doi10.1088/1361-6382/abba48
dc.identifier.issn0264-9381
dc.identifier.issn1361-6382
dc.identifier.issue23en_US
dc.identifier.scopus2-s2.0-85096287696
dc.identifier.scopusqualityQ1
dc.identifier.urihttp://doi.org/10.1088/1361-6382/abba48
dc.identifier.urihttps://hdl.handle.net/20.500.12846/122
dc.identifier.volume37en_US
dc.identifier.wosWOS:000584941200001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorÇamlıbel, Ali Kazım
dc.language.isoen
dc.publisherIop Publishing Ltd
dc.relation.ispartofClassical And Quantum Gravity
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectSupernova Type Iaen_US
dc.subjectDark Energyen_US
dc.subjectModel-Independent Analysisen_US
dc.subjectTransition Redshiften_US
dc.titlePantheon update on a model-independent analysis of cosmological supernova data
dc.typeArticle

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WoS İndeksli Yayınlar Koleksiyonu
Elektrik-Elektronik Mühendisliği Bölümü Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu