Topology of Cosmic Domains and Strings & When does causality constrain the monopole abundance?

Matteo Zatti from IFT will present the following papers:

'Topology of Cosmic Domains and Strings', T.W.B. Kibble (J.Phys.A 9 (1976) 1387-1398):

Abstract: The causality bounds on monopole abundance are reexamined in the light of recently constructed models which display very rapid monopole annihilation. It is shown that the behavior displayed in these models is consistent with causality, and that the proper formulation of the causality bounds is very dependent on the representation content of the model. By invoking intermediate phases with appropriate types of symmetry breaking, it is possible to annihilate essentially all monopoles, or even to avoid their ever appearing.

 T_W_B_Kibble_1976_J._Phys._A__Math._Gen._9_1387.pdf

'When does causality constrain the monopole abundance?', T.W.B. Kibble and Erick J. Weinberg (Phys.Rev.D 43 (1991) 3188-3190):

Abstract: The causality bounds on monopole abundance are reexamined in the light of recently constructed models which display very rapid monopole annihilation. It is shown that the behavior displayed in these models is consistent with causality, and that the proper formulation of the causality bounds is very dependent on the representation content of the model. By invoking intermediate phases with appropriate types of symmetry breaking, it is possible to annihilate essentially all monopoles, or even to avoid their ever appearing.

kibble1991.pdf

Further reading: 'Sections 7.3 and 7.4 from Classical solutions in quantum field theory: Solitons and Instantons in High Energy Physics' (Erick J. Weinberg, 2012, Cambridge University Press)