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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Phenomenology of Dark Matter fromNon-Minimal Universal Extra DimensionsBonnevier, Johan January 2011 (has links)
We give a general introduction to particle physics, and in particular to particlephysics in extra dimensions. Furthermore, we introduce the concept of dark matter(DM) and discuss some suggestions for what it originates from. Next, we calculatethe cross-section for DM annihilation in the framework of non-minimal universalextra dimensions. This process gives mono-energetic gamma-ray lines with energyclose to the DM particle mass. The calculations are performed for two different DMcandidates, U(1)Y-gaugebosonen B1 och den laddningsneutrala SU(2)L-gaugebosonen Z1. MM-kandidaten är alltid den lättaste partikeln inom den betraktade teorin. Störst tvärsnitt får man när Z1 tas som den lättaste partikeln, och alltså som MM-kandidat, trots att den är tyngre än vad B1 är när den är tagen som teorins lättaste partikel. Anledningen till att tvärsnittet blir större för Z1 är att den har icke fösumbara självväxelverkningarr, vilket gör att många fler Feynmandiagram bidrar.
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Simulations of Quantum Black Hole collisions at the LHC with PYTHIANiblaeus, Carl January 2011 (has links)
In this bachelor's thesis the concept of microscopical black hole production at colliders is investigated. By using extra dimensional models where the value of the Planck mass can be reduced to the TeV scale, gravity can be made stronger at small distances and the Hierarchy problem can be solved. Since gravity is much stronger already at the TeV-scale, there is a possibility that microscopical black holes are produced at the LHC. In this thesis the possibility to produce Quantum Black Holes, black holes with masses around the Planck mass, is implemented in the event generator PYTHIA. Events where the Quantum Black Holes decay into two particles are simulated and studied. A main contribution is successful colour connections between the final states. Something to solve in future simulations is how to give the black holes a spectrum of masses.
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