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dc.date.accessioned2013-03-12T08:25:34Z
dc.date.available2013-03-12T08:25:34Z
dc.date.issued2010en_US
dc.date.submitted2010-06-01en_US
dc.identifier.citationWinther, Hans Arnold. Chameleon model with field-dependent couplings. Masteroppgave, University of Oslo, 2010en_US
dc.identifier.urihttp://hdl.handle.net/10852/10914
dc.description.abstractWe investigate scalar-field theories with a field-dependent coupling to matter and show the existence of a chameleon mechanism. The thin-shell solutions for a spherical body are found, and used to investigate the consequences for the Eöt-Wash experiment, fifth-force searches and Casimir force experiments. Requiring that the scalar-field evades gravitational tests, we find that the coupling is sensitive to a mass-scale which is of order of the Hubble scale today. The background evolution is found to agree with LDCM, but the linear matter perturbations will, for some values of the parameters exhibit a scale dependent growth which may allow future experiments of the large scale structure to discriminate our models from LCDM. However, for this to be the case, local gravity bounds require that the scalar-field couples to dark matter only.eng
dc.language.isoengen_US
dc.subjectkosmologi mørk energi modifisert gravitasjonen_US
dc.titleChameleon model with field-dependent couplingsen_US
dc.typeMaster thesisen_US
dc.date.updated2010-07-01en_US
dc.creator.authorWinther, Hans Arnolden_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=Winther, Hans Arnold&rft.title=Chameleon model with field-dependent couplings&rft.inst=University of Oslo&rft.date=2010&rft.degree=Masteroppgaveen_US
dc.identifier.urnURN:NBN:no-25073en_US
dc.type.documentMasteroppgaveen_US
dc.identifier.duo103211en_US
dc.contributor.supervisorDavid F. Motaen_US
dc.identifier.bibsys101478216en_US
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/10914/1/master_thesis_hansw_latex.rar
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/10914/2/master_thesis_hansw.pdf


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