Masaki Kawaguchi

Yamagata University

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Yamagata University

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Masaki Kawaguchi has a total of 5 co-authors. Here are the top co-authors by number of shared publications:

Minoru Eto
Yamagata University
4 shared publications
Muneto Nitta
Keio University
2 shared publications
Ryotaro Sasaki
Department of Physics, Yamagata University, Kojirakawa-machi 1-4-12, Yamagata, Yamagata 990-8560, Japan
2 shared publications
Filip Blaschke
Silesian University in Opava
1 shared publication
Masato Arai
Yamagata University
1 shared publication

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- 21 August 2026
- Published by American Physical Society (APS) in Physical Review D
Five benefits of grand unified S U ( 5 ) brane world scenario
by Masato Arai, Filip Blaschke, Minoru Eto, Masaki Kawaguchi
We construct an S U ( 5 ) grand unified theory on domain walls in the five-dimensional space-time. In this setup, we introduce an adjoint scalar field and a singlet that together form a set of five domain-wall solutions, realizing a dynamical brane world. The same scalar fields also localize chiral fermion zero modes around the walls via the Jackiw-Rebbi mechanism, break S U ( 5 ) down to the Standard Model gauge group via geometric Higgs mechanism and simultaneously trap gauge fields through a field-dependent gauge kinetic term. Furthermore, they enable localization of the Higgs field, providing a novel solution to the doublet-triplet splitting problem. As a result, all essential ingredients of the model are realized by a single adjoint scalar field and a singlet, making the construction very economical. We propose two realizations of the Higgs sector, derive the four-dimensional effective theory, and demonstrate that the Standard Model Yukawa couplings at the weak scale can be reproduced from the five-dimensional Yukawa couplings by the renormalization group analysis with a suitable choice of parameters.
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- 21 August 2026
- Published by American Physical Society (APS) in Physical Review D
Open Access
Five benefits of grand unified S U ( 5 ) brane world scenario
by Masato Arai, Filip Blaschke, Minoru Eto, Masaki Kawaguchi
We construct an S U ( 5 ) grand unified theory on domain walls in the five-dimensional space-time. In this setup, we introduce an adjoint scalar field and a singlet that together form a set of five domain-wall solutions, realizing a dynamical brane world. The same scalar fields also localize chiral fermion zero modes around the walls via the Jackiw-Rebbi mechanism, break S U ( 5 ) down to the Standard Model gauge group via geometric Higgs mechanism and simultaneously trap gauge fields through a field-dependent gauge kinetic term. Furthermore, they enable localization of the Higgs field, providing a novel solution to the doublet-triplet splitting problem. As a result, all essential ingredients of the model are realized by a single adjoint scalar field and a singlet, making the construction very economical. We propose two realizations of the Higgs sector, derive the four-dimensional effective theory, and demonstrate that the Standard Model Yukawa couplings at the weak scale can be reproduced from the five-dimensional Yukawa couplings by the renormalization group analysis with a suitable choice of parameters.
Open Access
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Cited by 14
- 8 September 2020
- Published by American Physical Society (APS) in Physical Review D
Exact solutions of domain wall junctions in arbitrary dimensions
by Minoru Eto, Masaki Kawaguchi, Muneto Nitta, Ryotaro Sasaki
Exact analytic solutions of static, stable, nonplanar Bogomol’nyi-Prasad-Sommerfield (BPS) domain wall junctions are obtained in extended Abelian-Higgs models in ( $D + 1$ )-dimensional spacetime. For specific choice of mass parameters, the Lagrangian is invariant under the symmetric group $S_{D + 1}$ of degree $D + 1$ spontaneously broken down to $S_{D}$ in vacua, admitting $S_{D + 1} / S_{D}$ domain wall junctions. In $D = 2$ , there are three vacua and three domain walls meeting at a junction point, in which the conventional topological charges $Y$ and $Z$ exist for the BPS domain wall junctions and the BPS domain walls, respectively, as known before. In $D = 3$ , there are four vacua, six domain walls, four junction lines on which three domain walls meet, and one junction point on which all the six domain walls meet. We define a new topological charge $X$ for the junction point in addition to the conventional topological charges $Y$ and $Z$ . In general dimensions, we find that the configuration expressed in the $D$ -dimensional real space is dual to a regular $D$ -simplex in the $D$ -dimensional internal space and that a $d$ -dimensional subsimplex of the regular $D$ -simplex corresponds to a ( $D - d$ )-dimensional intersection. Topological charges are generalized to the level- $d$ wall charge $W_{d}$ for the $d$ -dimensional subsimplexes.
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- 8 September 2020
- Published by American Physical Society (APS) in Physical Review D
Open Access
Exact solutions of domain wall junctions in arbitrary dimensions
by Minoru Eto, Masaki Kawaguchi, Muneto Nitta, Ryotaro Sasaki
Exact analytic solutions of static, stable, nonplanar Bogomol’nyi-Prasad-Sommerfield (BPS) domain wall junctions are obtained in extended Abelian-Higgs models in ( $D + 1$ )-dimensional spacetime. For specific choice of mass parameters, the Lagrangian is invariant under the symmetric group $S_{D + 1}$ of degree $D + 1$ spontaneously broken down to $S_{D}$ in vacua, admitting $S_{D + 1} / S_{D}$ domain wall junctions. In $D = 2$ , there are three vacua and three domain walls meeting at a junction point, in which the conventional topological charges $Y$ and $Z$ exist for the BPS domain wall junctions and the BPS domain walls, respectively, as known before. In $D = 3$ , there are four vacua, six domain walls, four junction lines on which three domain walls meet, and one junction point on which all the six domain walls meet. We define a new topological charge $X$ for the junction point in addition to the conventional topological charges $Y$ and $Z$ . In general dimensions, we find that the configuration expressed in the $D$ -dimensional real space is dual to a regular $D$ -simplex in the $D$ -dimensional internal space and that a $d$ -dimensional subsimplex of the regular $D$ -simplex corresponds to a ( $D - d$ )-dimensional intersection. Topological charges are generalized to the level- $d$ wall charge $W_{d}$ for the $d$ -dimensional subsimplexes.
Cited by 14
Open Access
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Cited by 17
- 28 May 2020
- Published by American Physical Society (APS) in Physical Review D
Exhausting all exact solutions of BPS domain wall networks in arbitrary dimensions
by Minoru Eto, Masaki Kawaguchi, Muneto Nitta, Ryotaro Sasaki
We obtain full moduli parameters for generic nonplanar Bogomol’nyi-Prasad-Sommerfield networks of domain walls in an extended Abelian-Higgs model with $N$ complex scalar fields and exhaust all exact solutions in the corresponding $C P^{N - 1}$ model. We develop a convenient description by grid diagrams which are polytopes determined by mass parameters of the model. To illustrate the validity of our method, we work out nonplanar domain wall networks for lower $N$ in $3 + 1$ dimensions. In general, the networks can have compact vacuum bubbles, which are finite vacuum regions surrounded by domain walls, when the polytopes of the grid diagrams have inner vertices, and the size of bubbles can be controlled by moduli parameters. We also construct domain wall networks with bubbles in the shapes of the Platonic, Archimedean, Catalan, and Kepler-Poinsot solids.
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- 28 May 2020
- Published by American Physical Society (APS) in Physical Review D
Open Access
Exhausting all exact solutions of BPS domain wall networks in arbitrary dimensions
by Minoru Eto, Masaki Kawaguchi, Muneto Nitta, Ryotaro Sasaki
We obtain full moduli parameters for generic nonplanar Bogomol’nyi-Prasad-Sommerfield networks of domain walls in an extended Abelian-Higgs model with $N$ complex scalar fields and exhaust all exact solutions in the corresponding $C P^{N - 1}$ model. We develop a convenient description by grid diagrams which are polytopes determined by mass parameters of the model. To illustrate the validity of our method, we work out nonplanar domain wall networks for lower $N$ in $3 + 1$ dimensions. In general, the networks can have compact vacuum bubbles, which are finite vacuum regions surrounded by domain walls, when the polytopes of the grid diagrams have inner vertices, and the size of bubbles can be controlled by moduli parameters. We also construct domain wall networks with bubbles in the shapes of the Platonic, Archimedean, Catalan, and Kepler-Poinsot solids.
Cited by 17
Open Access
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Cited by 8
- 8 October 2019
- Published by Springer Nature in Journal of High Energy Physics
Localization of gauge bosons and the Higgs mechanism on topological solitons in higher dimensions
by Minoru Eto, Masaki Kawaguchi
We provide complete and self-contained formulas about localization of mass-less/massive Abelian gauge fields on topological solitons in generic D dimensions via a field dependent gauge kinetic term. The localization takes place when a stabilizer (a scalar field) is condensed in the topological soliton. We show that the localized gauge bosons are massless when the stabilizer is neutral. On the other hand, they become massive for the charged stabilizer as a consequence of interplay between the localization mechanism and the Higgs mechanism. For concreteness, we give two examples in six dimensions. The one is domain wall intersections and the other is an axially symmetric soliton background.
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- 8 October 2019
- Published by Springer Nature in Journal of High Energy Physics
Open Access
Localization of gauge bosons and the Higgs mechanism on topological solitons in higher dimensions
by Minoru Eto, Masaki Kawaguchi
We provide complete and self-contained formulas about localization of mass-less/massive Abelian gauge fields on topological solitons in generic D dimensions via a field dependent gauge kinetic term. The localization takes place when a stabilizer (a scalar field) is condensed in the topological soliton. We show that the localized gauge bosons are massless when the stabilizer is neutral. On the other hand, they become massive for the charged stabilizer as a consequence of interplay between the localization mechanism and the Higgs mechanism. For concreteness, we give two examples in six dimensions. The one is domain wall intersections and the other is an axially symmetric soliton background.
Cited by 8