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Gamma Rays from Kaluza-Klein Dark Matter
Stockholm University, Faculty of Science, Department of Physics.
2005 In: Physical Review Letters, Vol. 94, no 131301, 4 pages- p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2005. Vol. 94, no 131301, 4 pages- p.
Identifiers
URN: urn:nbn:se:su:diva-24675OAI: oai:DiVA.org:su-24675DiVA: diva2:198085
Note
Part of urn:nbn:se:su:diva-7345Available from: 2008-02-07 Created: 2008-02-07Bibliographically approved
In thesis
1. Light from Dark Matter: Hidden Dimensions, Supersymmetry, and Inert Higgs
Open this publication in new window or tab >>Light from Dark Matter: Hidden Dimensions, Supersymmetry, and Inert Higgs
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Recent observational achievements within cosmology and astrophysics have lead to a concordance model in which the energy content in our Universe is dominated by presumably fundamentally new and exotic ingredients – dark energy and dark matter. To reveal the nature of these ingredients is one of the greatest challenges in physics.

The detection of a signal in gamma rays from dark matter annihilation would significantly contribute to revealing the nature of dark matter. This thesis presents derived imprints in gamma-ray spectra that could be expected from dark matter annihilation. In particular, dark matter particle candidates emerging in models with extra space dimensions, extending the standard model to be supersymmetric, and introducing an inert Higgs doublet are investigated. In all these scenarios dark matter annihilation induces sizeable and distinct signatures in their gamma-ray spectra. The predicted signals are in the form of monochromatic gamma-ray lines or a pronounced spectrum with a sharp cutoff at the dark matter particle’s mass. These signatures have no counterparts in the expected astrophysical background and are therefore well suited for dark matter searches.

Furthermore, numerical simulations of galaxies are studied to learn how baryons, that is, stars and gas, affect the expected dark matter distribution inside disk galaxies such as the Milky Way. From regions of increased dark matter concentrations, annihilation signals are expected to be the strongest. Estimations of dark matter induced gamma-ray fluxes from such regions are presented.

The types of dark matter signals presented in this thesis will be searched for with existing and future gamma-ray telescopes.

Finally, a claimed detection of dark matter annihilation into gamma rays is discussed and found to be unconvincing.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2008. 184 p.
National Category
Physical Sciences
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-7345 (URN)978-91-7155-548-9 (ISBN)
Public defence
2008-02-29, FD5, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:15
Opponent
Supervisors
Available from: 2008-02-07 Created: 2008-02-07Bibliographically approved

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