Bayesian analysis of the backreaction models

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dc.contributor.authorKurek, Aleksandra
dc.contributor.authorBolejko, Krzysztof
dc.contributor.authorSzydłowski, Marek
dc.date.accessioned2021-10-08T07:11:31Z
dc.date.available2021-10-08T07:11:31Z
dc.date.issued2010
dc.description.abstractWe present a Bayesian analysis of four different types of backreaction models, which are based on the Buchert equations. In this approach, one considers a solution to the Einstein equations for a general matter distribution and then an average of various observable quantities is taken. Such an approach became of considerable interest when it was shown that it could lead to agreement with observations without resorting to dark energy. In this paper we compare the {Lambda}CDM model and the backreaction models with type Ia supernovae, baryon acoustic oscillations, and cosmic microwave background data, and find that the former is favored. However, the tested models were based on some particular assumptions about the relation between the average spatial curvature and the backreaction, as well as the relation between the curvature and curvature index. In this paper we modified the latter assumption, leaving the former unchanged. We find that, by varying the relation between the curvature and curvature index, we can obtain a better fit. Therefore, some further work is still needed--in particular, the relation between the backreaction and the curvature should be revisited in order to fully determine the feasibility of the backreaction models to mimic dark energy.
dc.identifier.apacitationKurek, A., Bolejko, K., & Szydłowski, M. (2010). Bayesian analysis of the backreaction models. <i>Physical Review D - Particles and Fields</i>, 81(6), 174 - 177. http://hdl.handle.net/11427/34630en_ZA
dc.identifier.chicagocitationKurek, Aleksandra, Krzysztof Bolejko, and Marek Szydłowski "Bayesian analysis of the backreaction models." <i>Physical Review D - Particles and Fields</i> 81, 6. (2010): 174 - 177. http://hdl.handle.net/11427/34630en_ZA
dc.identifier.citationKurek, A., Bolejko, K. & Szydłowski, M. 2010. Bayesian analysis of the backreaction models. <i>Physical Review D - Particles and Fields.</i> 81(6):174 - 177. http://hdl.handle.net/11427/34630en_ZA
dc.identifier.issn0556-2821
dc.identifier.issn1089-4918
dc.identifier.ris TY - Journal Article AU - Kurek, Aleksandra AU - Bolejko, Krzysztof AU - Szydłowski, Marek AB - We present a Bayesian analysis of four different types of backreaction models, which are based on the Buchert equations. In this approach, one considers a solution to the Einstein equations for a general matter distribution and then an average of various observable quantities is taken. Such an approach became of considerable interest when it was shown that it could lead to agreement with observations without resorting to dark energy. In this paper we compare the {Lambda}CDM model and the backreaction models with type Ia supernovae, baryon acoustic oscillations, and cosmic microwave background data, and find that the former is favored. However, the tested models were based on some particular assumptions about the relation between the average spatial curvature and the backreaction, as well as the relation between the curvature and curvature index. In this paper we modified the latter assumption, leaving the former unchanged. We find that, by varying the relation between the curvature and curvature index, we can obtain a better fit. Therefore, some further work is still needed--in particular, the relation between the backreaction and the curvature should be revisited in order to fully determine the feasibility of the backreaction models to mimic dark energy. DA - 2010 DB - OpenUCT DP - University of Cape Town IS - 6 J1 - Physical Review D - Particles and Fields LK - https://open.uct.ac.za PY - 2010 SM - 0556-2821 SM - 1089-4918 T1 - Bayesian analysis of the backreaction models TI - Bayesian analysis of the backreaction models UR - http://hdl.handle.net/11427/34630 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34630
dc.identifier.vancouvercitationKurek A, Bolejko K, Szydłowski M. Bayesian analysis of the backreaction models. Physical Review D - Particles and Fields. 2010;81(6):174 - 177. http://hdl.handle.net/11427/34630.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematics
dc.publisher.facultyFaculty of Science
dc.sourcePhysical Review D - Particles and Fields
dc.source.journalissue6
dc.source.journalvolume81
dc.source.pagination174 - 177
dc.source.urihttps://dx.doi.org/10.1103/PhysRevD.81.063515
dc.subject.otherPDF is pre-print astrophysics
dc.subject.othercosmology and astronomy
dc.subject.otherbaryons
dc.subject.othercomparative evaluations
dc.subject.otherdistribution
dc.subject.othereinstein field equations
dc.subject.othermathematical solutions
dc.subject.othernonluminous matter
dc.subject.otheroscillations
dc.subject.otherrelict radiation
dc.subject.othersupernovae binary stars
dc.subject.otherelectromagnetic radiation
dc.subject.otherelementary particles
dc.subject.otherequations
dc.subject.othereruptive variable stars
dc.subject.otherevaluation
dc.subject.otherfermions
dc.subject.otherfield equations
dc.subject.otherhadrons
dc.subject.othermatter
dc.subject.othermicrowave radiation
dc.subject.otherradiations
dc.subject.otherstars
dc.subject.othervariable stars
dc.titleBayesian analysis of the backreaction models
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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