Numerical simulations of necklaces in SU(2) gauge-Higgs field theory

Hindmarsh, Mark, Rummukainen, Kari and Weir, David J (2017) Numerical simulations of necklaces in SU(2) gauge-Higgs field theory. Physical Review D, 95 (6). a063520. ISSN 2470-0010

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Abstract

We perform the first numerical simulations of necklaces in a non-Abelian gauge theory. Necklaces are composite classical solutions which can be interpreted as monopoles trapped on strings, rather generic structures in a Grand Unified Theory. We generate necklaces from random initial conditions, modeling a phase transition in the early Universe, and study the evolution. For all cases, we find that the necklace system shows scaling behavior similar to that of a network of ordinary cosmic strings. Furthermore, our simulations indicate that comoving distance between the monopoles or semipoles along the string asymptotes to a constant value at late times. This means that, while the monopole-to-string energy density ratio decreases as the inverse of the scale factor, a horizon-size length of string has a large number of monopoles, significantly affecting the dynamics of string loops. We argue that gravitational wave bounds from millisecond pulsar timing on the string tension in the Nambu-Goto scenario are greatly relaxed.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 05 Aug 2020 07:32
Last Modified: 06 Aug 2020 08:15
URI: http://sro.sussex.ac.uk/id/eprint/92937

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