Type I Abelian Higgs strings: evolution and cosmic microwave background constraints

Hindmarsh, Mark, Lizarraga, Joanes, Urrestilla, Jon, Daverio, David and Kunz, Martin (2019) Type I Abelian Higgs strings: evolution and cosmic microwave background constraints. Physical Review D, 99 (8). 083522-1-12. ISSN 2470-0010

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We present results from the first simulations of networks of Type I Abelian Higgs cosmic strings to include both matter and radiation eras and Cosmic Microwave Background (CMB) constraints. In Type I strings, the string tension is a slowly decreasing function of the ratio of the scalar and gauge mass-squared,β. We find that the mean string separation shows no dependence on β, and that the energy-momentum tensor correlators decrease approximately in proportion to the square of the string tension, with additional O(1) correction factors which asymptote to constants below β≲0.01. Strings in models with low self-couplings can therefore satisfy current CMB bounds at higher symmetry-breaking scales. This is particularly relevant for models where the gauge symmetry is broken in a supersymmetric flat direction, for which the effective self-coupling can be extremely small. If our results can be extrapolated to β≃10−15,even strings formed at 10-16 GeV (approximately the grand unification scale in supersymmetric extensions of the Standard Model) can be compatible with CMB constraints.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Theoretical Particle Physics Research Group
Subjects: Q Science
Q Science > QC Physics
Depositing User: Alice Jackson
Date Deposited: 02 Jul 2019 09:05
Last Modified: 02 Jul 2019 09:15
URI: http://sro.sussex.ac.uk/id/eprint/84689

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Project NameSussex Project NumberFunderFunder Ref
South-Eastern Particle Theory Alliance Sussex - RHUL - UCL 2017-2020 - Sussex nodeG2074STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/P000819/1