Seminarios del GIRG 5 de junio 2015, 16h LL313, Esc. de Física
PhD student Erwan Allys
Institut D’astrophysique de Paris.
Escuela de Física, Universidad Industrial de Santander.
Bucaramanga, Colombia
Abstract
Cosmic strings, i.e. linear topological defects which are expected to form during the Spontaneous Symmetry Breaking (SSB) of Grand Unified Theory (GUT), permit to probe particle physics up to energies around 10^16 GeV: the lack of observational signatures provide serious constraints for those theories. Until now, only toy-models have been used to describe strings, assuming a minimal field content necessary to form them. However, an actual implementation of their microscopic structure in a realistic particle physic and cosmological context could give new insights. For example, the property to have the scale of formation of the strings as only characteristic energy can be wrong, due to possible contributions of higher energy fields. Moreover, a more complicated microscopic structure, stemming from the condensation of some GUT fields in the strings, could lead to a more complicated phenomenology for the bosonic currents which can appear in their core. We present general results which can be obtained when studying these cosmic strings, first in a general Supersymmetric (SUSY) GUT with standard or hybrid inflation, and then in a given SO(10) example, focusing on the bosonic sector of these theories.