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Cosmic string in Abelian-Higgs model with enhanced symmetry — Implication to the axion domain-wall problem

In our previous work, we found new types of the cosmic string solutions in the Abelian-Higgs model with an enhanced U(1) global symmetry. We dubbed those solutions as the compensated/uncompensated strings. The compensated string is similar to the conventional cosmic string in the Abrikosov-Nielsen-O...

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Autores principales: Hiramatsu, Takashi, Ibe, Masahiro, Suzuki, Motoo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7476751/
https://www.ncbi.nlm.nih.gov/pubmed/32921971
http://dx.doi.org/10.1007/JHEP09(2020)054
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author Hiramatsu, Takashi
Ibe, Masahiro
Suzuki, Motoo
author_facet Hiramatsu, Takashi
Ibe, Masahiro
Suzuki, Motoo
author_sort Hiramatsu, Takashi
collection PubMed
description In our previous work, we found new types of the cosmic string solutions in the Abelian-Higgs model with an enhanced U(1) global symmetry. We dubbed those solutions as the compensated/uncompensated strings. The compensated string is similar to the conventional cosmic string in the Abrikosov-Nielsen-Olesen (ANO) string, around which only the would-be Nambu-Goldstone (NG) boson winds. Around the uncompensated string, on the other hand, the physical NG boson also winds, where the physical NG boson is associated with the spontaneous breaking of the enhanced symmetry. Our previous simulation in the 2+1 dimensional spacetime confirmed that both the compensated/uncompensated strings are formed at the phase transition of the symmetry breaking. Non-trivial winding of the physical NG boson around the strings potentially causes the so-called axion domain- wall problem when the model is applied to the axion model. In this paper, we perform simulation in the 3+1 dimensional spacetime to discuss the fate of the uncompensated strings. We observe that the evolution of the string-network is highly complicated in the 3+1 dimensional simulation compared with that seen in the previous simulation. Despite such complications, we find that the number of the uncompensated strings which could cause can be highly suppressed at late times. Our observation suggests that the present setup can be applied to the axion model without suffering from the axion domain-wall problem.
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spelling pubmed-74767512020-09-08 Cosmic string in Abelian-Higgs model with enhanced symmetry — Implication to the axion domain-wall problem Hiramatsu, Takashi Ibe, Masahiro Suzuki, Motoo J High Energy Phys Regular Article - Theoretical Physics In our previous work, we found new types of the cosmic string solutions in the Abelian-Higgs model with an enhanced U(1) global symmetry. We dubbed those solutions as the compensated/uncompensated strings. The compensated string is similar to the conventional cosmic string in the Abrikosov-Nielsen-Olesen (ANO) string, around which only the would-be Nambu-Goldstone (NG) boson winds. Around the uncompensated string, on the other hand, the physical NG boson also winds, where the physical NG boson is associated with the spontaneous breaking of the enhanced symmetry. Our previous simulation in the 2+1 dimensional spacetime confirmed that both the compensated/uncompensated strings are formed at the phase transition of the symmetry breaking. Non-trivial winding of the physical NG boson around the strings potentially causes the so-called axion domain- wall problem when the model is applied to the axion model. In this paper, we perform simulation in the 3+1 dimensional spacetime to discuss the fate of the uncompensated strings. We observe that the evolution of the string-network is highly complicated in the 3+1 dimensional simulation compared with that seen in the previous simulation. Despite such complications, we find that the number of the uncompensated strings which could cause can be highly suppressed at late times. Our observation suggests that the present setup can be applied to the axion model without suffering from the axion domain-wall problem. Springer Berlin Heidelberg 2020-09-07 2020 /pmc/articles/PMC7476751/ /pubmed/32921971 http://dx.doi.org/10.1007/JHEP09(2020)054 Text en © The Author(s) 2020 Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0 (http://creativecommons.org/licenses/by/4.0/) ), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
spellingShingle Regular Article - Theoretical Physics
Hiramatsu, Takashi
Ibe, Masahiro
Suzuki, Motoo
Cosmic string in Abelian-Higgs model with enhanced symmetry — Implication to the axion domain-wall problem
title Cosmic string in Abelian-Higgs model with enhanced symmetry — Implication to the axion domain-wall problem
title_full Cosmic string in Abelian-Higgs model with enhanced symmetry — Implication to the axion domain-wall problem
title_fullStr Cosmic string in Abelian-Higgs model with enhanced symmetry — Implication to the axion domain-wall problem
title_full_unstemmed Cosmic string in Abelian-Higgs model with enhanced symmetry — Implication to the axion domain-wall problem
title_short Cosmic string in Abelian-Higgs model with enhanced symmetry — Implication to the axion domain-wall problem
title_sort cosmic string in abelian-higgs model with enhanced symmetry — implication to the axion domain-wall problem
topic Regular Article - Theoretical Physics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7476751/
https://www.ncbi.nlm.nih.gov/pubmed/32921971
http://dx.doi.org/10.1007/JHEP09(2020)054
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