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Significant Gamma Lines from Inert Higgs Dark Matter
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2007 (English)In: Physical Review Letters, Vol. 99, no 041301Article in journal (Refereed) Published
Abstract [en]

One way to unambiguously confirm the existence of particle dark matter and determine its mass would be to detect its annihilation into monochromatic gamma-rays in upcoming telescopes. One of the most minimal models for dark matter is the inert doublet model, obtained by adding another Higgs doublet with no direct coupling to fermions. For a mass between 40 and 80 GeV, the lightest of the new inert Higgs particles can give the correct cosmic abundance of cold dark matter in agreement with current observations. We show that for this scalar dark matter candidate, the annihilation signal of monochromatic γγ and Zγ final states would be exceptionally strong. The energy range and rates for these gamma-ray line signals make them ideal to search for with the soon upcoming GLAST satellite.

Place, publisher, year, edition, pages
American Physical Society , 2007. Vol. 99, no 041301
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-24680DOI: 10.1103/PhysRevLett.99.041301ISI: 000248345800010OAI: oai:DiVA.org:su-24680DiVA: diva2:198090
Note
Part of urn:nbn:se:su:diva-7345Available from: 2008-02-07 Created: 2008-02-07 Last updated: 2010-05-19Bibliographically 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
2. Phenomenology of Inert Scalar and Supersymmetric Dark Matter
Open this publication in new window or tab >>Phenomenology of Inert Scalar and Supersymmetric Dark Matter
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

While the dark matter has so far only revealed itself through the gravitational influence it exerts on its surroundings, there are good reasons to believe it is made up by WIMPs – a hypothetical class of heavy elementary particles not encompassed by the Standard Model of particle physics.

The Inert Doublet Model constitutes a simple extension of the Standard Model Higgs sector. The model provides a new set of scalar particles, denoted inert scalars because of their lack of direct coupling to matter, of which the lightest is a WIMP dark matter candidate.

Another popular Standard Model extension is that of supersymmetry. In the most minimal scenario the particle content is roughly doubled, and the lightest of the new supersymmetric particles, which typically is a neutralino, is a WIMP dark matter candidate.

In this thesis the phenomenology of inert scalar and supersymmetric dark matter is studied. Relic density calculations are performed, and experimental signatures in indirect detection experiments and accelerator searches are derived.

The Inert Doublet Model shows promising prospects for indirect detection of dark matter annihilations into monochromatic photons. It is also constrained by the old LEP II accelerator data.

Some phenomenological differences between the Minimal Supersymmetric Standard Model and a slight extension, the Beyond the Minimal Supersymmetric Standard Model, can be found. Also, supersymmetric dark matter models can be detected already within the early LHC accelerator data.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2010. 85 p.
Keyword
Dark matter, inert scalars, supersymmetry, indirect detection, accelerator searches
National Category
Physical Sciences Subatomic Physics Subatomic Physics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-39278 (URN)978-91-7447-097-0 (ISBN)
Public defence
2010-06-10, FB52, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2010-05-19 Created: 2010-05-17 Last updated: 2010-05-17Bibliographically approved

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