Cosmic strings are linear concentrations of energy of macroscopic size. Cosmic superstrings come from string theory and can form junctions. In the introduction, we define more precisely the strings, their formation and the main properties of single straight cosmic strings or superstrings. Then, we focus on those latter and study some major properties of junctions. As a first step, we find the metric close to a junction of strings in the weak-field approximation. We then find some signatures that would reveal their presence : Namely, the lensing that they create and the shift in photon wavelength passing through (leading to the Kaiser-Stebbins effect) in chapter 2, and the gravitational radiation they can emit in chapter 3. / Les supercordes cosmiques correspondent a des concentrations linaires d'energieemprisonnee de taille macroscopique. Les supercordes cosmiques, sont celles resultant de la theorie des cordes et peuvent former des jonctions. L'introduction definit plus precisement les cordes, leur formation et les principales proprietes des cordes ou des supercordes droites. Ensuite, on se focalise sur ces dernieres en etudiant les principales proprietes des jonctions. Un premier pas consiste a trouver la metrique proched'une jonction de cordes dans l'approximation de champ faible. Ensuite on trouverades possibles signatures qui reveleraient leur presence : L'effet de lentilles qu'ellescreent et le decalage dans la longueur d'onde des photons passant aux alentours(ce qui mene a l'effet Kaiser-Stebbins) au chapitre 2, et la radiation gravitationellequ'elles peuvent emettre au chapitre 3.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.66949 |
| Date | January 2009 |
| Creators | Karouby, Johanna |
| Contributors | Robert Brandenberger (Internal/Supervisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Physics) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | Electronically-submitted theses. |
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