We study the effect of the thermal background on the mechanism of electroweak baryogenesis. Firstly, we model the effect of collisions by solving the Schrodinger equation in presence of a potential representing the bubble of phase transition of the Higgs field and a series of delta functions simulating the collisions amongst the particles. We validate this technique in chapter 2 by comparing it to the results obtained by application of the Born approximation. Later, we apply this "delta functions recurency technique" to the case of relativistic particles by solving the Dirac equation in the precense of similar potentials. In the second part of this thesis, we attempt to model the interaction by a totally distinct formalism that incorporates the effect of the exchange of momentum during a collision between the particles of the thermal background. To this end, we begin by describing a preexisting method for predicting the evolution of the density matrix of a system subjected to an interaction. Then we expend it in order to model the effect of the thermal background on baryogenesis. Lastly, we apply the "density matrix formalism" to the case of relativistic particles.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.36594 |
| Date | January 2000 |
| Creators | Girard, Patrick, 1971- |
| Contributors | Cline, James (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | French |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Physics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001764674, proquestno: NQ64563, Theses scanned by UMI/ProQuest. |
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