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dc.date.accessioned2013-08-02T10:00:55Z
dc.date.available2013-08-02T10:00:55Z
dc.date.issued2013en_US
dc.date.submitted2013-05-29en_US
dc.identifier.citationGrönke, Max. Gravitational Redshift of Clusters in the Symmetron and Chameleon f(R) Models. Masteroppgave, University of Oslo, 2013en_US
dc.identifier.urihttp://hdl.handle.net/10852/36112
dc.description.abstractThe gravitational redshift in clusters of galaxies can be measured to probe gravity as was first done by Wojtak et al. (2011). Using N -body simulations we are able to analyze the gravitational redshift profiles for the symmetron and the Hu-Sawicky f(R) models. The characteristic feature of these models is the screening mechanism that hides the fifth force in dense environments recovering general relativity. We find that due to the nature of the screening, the deviation with respect to ΛCDM is highly dependent on the halo mass. So the f(R) parameters |fR0 − 1| = 10^−5 , n = 1 cause an enhancement of the gravitational signal by up to 60% for halos with masses between 3 × 10^12 M⊙ h^−1 and 10^14 M⊙ h^−1 . However, for both larger and smaller halos there is hardly any deviation present. The characteristic mass range, where the fifth force is most active, varies with the model parameters. Additionally, we observe not only a stronger but also a possible weaker gravitational redshift. This contradicts the usual assumption that the presence of a fifth force leads to a deeper potential well but may happen if screening in the central regions is active which results in a shift of the additional clustering to larger radii.eng
dc.language.isoengen_US
dc.titleGravitational Redshift of Clusters in the Symmetron and Chameleon f(R) Modelsen_US
dc.typeMaster thesisen_US
dc.date.updated2013-07-22en_US
dc.creator.authorGrönke, Maxen_US
dc.subject.nsiVDP::438en_US
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft.au=Grönke, Max&rft.title=Gravitational Redshift of Clusters in the Symmetron and Chameleon f(R) Models&rft.inst=University of Oslo&rft.date=2013&rft.degree=Masteroppgaveen_US
dc.identifier.urnURN:NBN:no-34409
dc.type.documentMasteroppgaveen_US
dc.identifier.duo181623en_US
dc.contributor.supervisorDavid F. Mota, Claudio Llinaresen_US
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/36112/1/2013-05-29_final.pdf


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