dc.contributor.author Forfang, Peder dc.date.accessioned 2017-09-07T22:32:45Z dc.date.available 2017-09-07T22:32:45Z dc.date.issued 2017 dc.identifier.citation Forfang, Peder. Kinetic screening of fields and stability of NEC violating configurations. Master thesis, University of Oslo, 2017 dc.identifier.uri http://hdl.handle.net/10852/58225 dc.description.abstract Following the discovery of the late-time acceleration, a multitude of extensions to General Relativity have been developed, seeking to shed light on this new phenomenon. Some of these models involve couplings to ordinary matter, suggesting an impact on gravitational effects. However, local measurements enforce severe constraints on these models, rendering them inadequate as cosmological theories. Thus there is purpose in finding mechanisms to hide the signature of these modifications in local environments, and as such restore the models viability. Screening mechanisms have been explored in the past, and successfully implemented in scalar field theories. In this thesis we will consider a screening mechanism inspired by k-mouflage on general vector field theories of the form $f(F^2)$ and $f(F^2, F\tilde{F})$. Further, we will analyse the stability about the screened solutions and look for healthy violations to the null energy condition. eng dc.language.iso eng dc.subject dc.title Kinetic screening of fields and stability of NEC violating configurations eng dc.type Master thesis dc.date.updated 2017-09-08T22:27:44Z dc.creator.author Forfang, Peder dc.identifier.urn URN:NBN:no-60770 dc.type.document Masteroppgave dc.identifier.fulltext Fulltext https://www.duo.uio.no/bitstream/handle/10852/58225/1/thesisfinal.pdf
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