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dc.contributor.authorRussell, Esra
dc.contributor.authorKılınç, Can Battal
dc.contributor.authorPashaev, Oktay
dc.date.accessioned2017-05-23T08:47:28Z
dc.date.available2017-05-23T08:47:28Z
dc.date.issued2014-08
dc.identifier.citationRussell, E., Kılınç, C.B., and Pashaev, O. (2014). Bianchi I model: An alternative way to model the present-day Universe. Monthly Notices of the Royal Astronomical Society, 442(3), 2331-2341. doi:10.1093/mnras/stu932en_US
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/stu932
dc.identifier.urihttp://hdl.handle.net/11147/5578
dc.description.abstractAlthough the new era of high-precision cosmology of the cosmic microwave background (CMB) radiation improves our knowledge to understand the infant as well as the presentday Universe, it also leads us to question the main assumption of the exact isotropy of the CMB. There are two pieces of observational evidence that hint towards there being no exact isotropy. These are: first, the existence of small anisotropy deviations from isotropy of theCMB radiation and secondly, the presence of large angle anomalies, although the existence of these anomalies is currently a huge matter of debate. These hints are particularly important since isotropy is one of the two main postulates of the Copernican principle on which the Friedmann Robertson Walker (FRW) models are built. This almost-isotropic CMB radiation implies that the universe is almost an FRW universe, as is proved by previous studies. Assuming that the matter component forms the deviations from isotropy in the CMB density fluctuations when matter and radiation decouples, we here attempt to find possible constraints on the FRW-type scale and Hubble parameter by using the Bianchi type I (BI) anisotropic model which is asymptotically equivalent to the standard FRW. To obtain constraints on such an anisotropic model, we derive average and late-time shear values that come from the anisotropy upper limits of the recent Planck data based on a model independent shear parameter of Maartens, Ellis & Stoeger and from the theoretical consistency relation. These constraints lead us to obtain a BI model which becomes an almost-FRWmodel in time, and which is consistent with the latest observational data of the CMB.en_US
dc.language.isoengen_US
dc.publisherOxford University Pressen_US
dc.relation.isversionof10.1093/mnras/stu932en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectEarly Universeen_US
dc.subjectLarge-scale structure of Universeen_US
dc.subjectCosmologyen_US
dc.titleBianchi I model: An alternative way to model the present-day Universeen_US
dc.typearticleen_US
dc.contributor.authorIDTR57865en_US
dc.contributor.iztechauthorRussell, Esra
dc.contributor.iztechauthorPashaev, Oktay
dc.relation.journalMonthly Notices of the Royal Astronomical Societyen_US
dc.contributor.departmentİYTE, Fen Fakültesi, Matematik Bölümüen_US
dc.identifier.volume442en_US
dc.identifier.issue3en_US
dc.identifier.startpage2331en_US
dc.identifier.endpage2341en_US
dc.identifier.wosWOS:000339924300033
dc.identifier.scopusSCOPUS:2-s2.0-84904569384
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


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