Non-Abelian strings and domain walls in two Higgs doublet models

Minoru Eto, Masafumi Kurachi, Muneto Nitta

Research output: Contribution to journalArticle

Abstract

Contrary to the standard model that does not admit topologically nontrivial solitons, two Higgs doublet models admit topologically stable vortex strings and domain walls. We numerically confirm the existence of a topological Z-string confining fractional Z-flux inside. We show that topological strings at sin θW = 0 limit reduce to non-Abelian strings which possess non-Abelian moduli S2 associated with spontaneous breakdown of the SU(2) custodial symmetry. We numerically solve the equations of motion for various parameter choices. It is found that a gauging U(1)Y always lowers the tension of the Z-string while it keeps that of the W-string. On the other hand, a deformation of the Higgs potential is either raising or lowering the tensions of the Z-string and W-string. We numerically obtain an effective potential for the non-Abelian moduli S2 for various parameter deformations under the restriction tan β = 1. It is the first time to show that there exists a certain parameter region where the topological W-string can be the most stable topological excitation, contrary to conventional wisdom of electroweak theories. We also obtain numerical solutions of composites of the string and domain walls in a certain condition.

Original languageEnglish
Article number195
JournalJournal of High Energy Physics
Volume2018
Issue number8
DOIs
Publication statusPublished - 2018 Aug 1

Fingerprint

domain wall
strings
confining
constrictions
equations of motion
solitary waves
breakdown
vortices
composite materials
symmetry
excitation

Keywords

  • Beyond Standard Model
  • Solitons Monopoles and Instantons

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Non-Abelian strings and domain walls in two Higgs doublet models. / Eto, Minoru; Kurachi, Masafumi; Nitta, Muneto.

In: Journal of High Energy Physics, Vol. 2018, No. 8, 195, 01.08.2018.

Research output: Contribution to journalArticle

@article{31fa5b1d63da4e4c88d64e05a50ce48a,
title = "Non-Abelian strings and domain walls in two Higgs doublet models",
abstract = "Contrary to the standard model that does not admit topologically nontrivial solitons, two Higgs doublet models admit topologically stable vortex strings and domain walls. We numerically confirm the existence of a topological Z-string confining fractional Z-flux inside. We show that topological strings at sin θW = 0 limit reduce to non-Abelian strings which possess non-Abelian moduli S2 associated with spontaneous breakdown of the SU(2) custodial symmetry. We numerically solve the equations of motion for various parameter choices. It is found that a gauging U(1)Y always lowers the tension of the Z-string while it keeps that of the W-string. On the other hand, a deformation of the Higgs potential is either raising or lowering the tensions of the Z-string and W-string. We numerically obtain an effective potential for the non-Abelian moduli S2 for various parameter deformations under the restriction tan β = 1. It is the first time to show that there exists a certain parameter region where the topological W-string can be the most stable topological excitation, contrary to conventional wisdom of electroweak theories. We also obtain numerical solutions of composites of the string and domain walls in a certain condition.",
keywords = "Beyond Standard Model, Solitons Monopoles and Instantons",
author = "Minoru Eto and Masafumi Kurachi and Muneto Nitta",
year = "2018",
month = "8",
day = "1",
doi = "10.1007/JHEP08(2018)195",
language = "English",
volume = "2018",
journal = "Journal of High Energy Physics",
issn = "1126-6708",
publisher = "Springer Verlag",
number = "8",

}

TY - JOUR

T1 - Non-Abelian strings and domain walls in two Higgs doublet models

AU - Eto, Minoru

AU - Kurachi, Masafumi

AU - Nitta, Muneto

PY - 2018/8/1

Y1 - 2018/8/1

N2 - Contrary to the standard model that does not admit topologically nontrivial solitons, two Higgs doublet models admit topologically stable vortex strings and domain walls. We numerically confirm the existence of a topological Z-string confining fractional Z-flux inside. We show that topological strings at sin θW = 0 limit reduce to non-Abelian strings which possess non-Abelian moduli S2 associated with spontaneous breakdown of the SU(2) custodial symmetry. We numerically solve the equations of motion for various parameter choices. It is found that a gauging U(1)Y always lowers the tension of the Z-string while it keeps that of the W-string. On the other hand, a deformation of the Higgs potential is either raising or lowering the tensions of the Z-string and W-string. We numerically obtain an effective potential for the non-Abelian moduli S2 for various parameter deformations under the restriction tan β = 1. It is the first time to show that there exists a certain parameter region where the topological W-string can be the most stable topological excitation, contrary to conventional wisdom of electroweak theories. We also obtain numerical solutions of composites of the string and domain walls in a certain condition.

AB - Contrary to the standard model that does not admit topologically nontrivial solitons, two Higgs doublet models admit topologically stable vortex strings and domain walls. We numerically confirm the existence of a topological Z-string confining fractional Z-flux inside. We show that topological strings at sin θW = 0 limit reduce to non-Abelian strings which possess non-Abelian moduli S2 associated with spontaneous breakdown of the SU(2) custodial symmetry. We numerically solve the equations of motion for various parameter choices. It is found that a gauging U(1)Y always lowers the tension of the Z-string while it keeps that of the W-string. On the other hand, a deformation of the Higgs potential is either raising or lowering the tensions of the Z-string and W-string. We numerically obtain an effective potential for the non-Abelian moduli S2 for various parameter deformations under the restriction tan β = 1. It is the first time to show that there exists a certain parameter region where the topological W-string can be the most stable topological excitation, contrary to conventional wisdom of electroweak theories. We also obtain numerical solutions of composites of the string and domain walls in a certain condition.

KW - Beyond Standard Model

KW - Solitons Monopoles and Instantons

UR - http://www.scopus.com/inward/record.url?scp=85052696324&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85052696324&partnerID=8YFLogxK

U2 - 10.1007/JHEP08(2018)195

DO - 10.1007/JHEP08(2018)195

M3 - Article

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1126-6708

IS - 8

M1 - 195

ER -