January 8th
when: Tuesday 8/1/2019, 13:15
where: KE E-541 (møterom)
speaker: David Weir (University of Helsinki)
title: Large-scale simulations of cosmic necklaces
abstract:
Cosmic strings are line-like topological defects that might have formed during phase transitions in the early universe. In certain symmetry breaking patterns 't Hooft-Polyakov monopoles can form on the strings, creating so-called cosmic necklaces. If there is an enlarged global symmetry group, the monopoles can further split into so-called semipoles. I will present the results of large-scale field theory simulations of these systems, confirming that a scaling network of cosmic necklaces forms in all the cases studied. Finally, I shall comment on the applicability of existing models of cosmic necklaces to our results, and offer possible explanations for the apparent disagreement.