Bulashenko, OlegGarcía Heveling, Leonardo2017-11-032017-11-032017-06https://hdl.handle.net/2445/117386Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2017, Tutor: Oleg BulashenkoA mathematical characterization of topological defects is provided, with a discussion of topological stability and the necessary conditions for stable defects to appear. Defect formation in symmetry-breaking phase transitions of the Universe is discussed, and a simple model for the formation of cosmic strings is given. Geodesics in a cosmic string spacetime are calculated for the study of gravitational lensing phenomena5 p.application/pdfengcc-by-nc-nd (c) García Heveling, 2017http://creativecommons.org/licenses/by-nc-nd/3.0/es/Models de cordaCosmologiaEspai i tempsTreballs de fi de grauString modelsCosmologySpace and timeBachelor's thesesinfo:eu-repo/semantics/bachelorThesisinfo:eu-repo/semantics/openAccess