Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Fujimoto, Yukihiro"'
Publikováno v:
J. Phys. A: Math. Theor. 55 (2022) 035302
We discuss quantum dynamics in the ring systems with double Y-junctions in which two arms have same length. The node of a Y-junction can be parametrized by U(3). Considering mathematically permitted junction conditions seriously, we formulate such sy
Externí odkaz:
http://arxiv.org/abs/2011.11937
Autor:
Fujimoto, Yukihiro, Hasegawa, Kouhei, Nishiwaki, Kenji, Sakamoto, Makoto, Takenaga, Kazunori, Tanaka, Pedro Hugo, Ueba, Inori
Publikováno v:
Prog Theor Exp Phys (2019)
We show that the observed quark/lepton mass hierarchy can be realized dynamically on an interval extra dimension with point interactions. In our model, the positions of the point interactions play a crucial role to control the quark/lepton mass hiera
Externí odkaz:
http://arxiv.org/abs/1905.11597
In this paper, we investigate a five-dimensional Dirac fermion on a quantum graph that consists of a single vertex and $N$ loops. We find that the model possesses a rich structure of boundary conditions for wavefunctions on the quantum graph and they
Externí odkaz:
http://arxiv.org/abs/1904.12458
Autor:
Fujimoto, Yukihiro, Hasegawa, Kouhei, Nishiwaki, Kenji, Sakamoto, Makoto, Tatsumi, Kentaro, Ueba, Inori
Publikováno v:
Phys. Rev. D 99, 065002 (2019)
A new realization of extended quantum-mechanical supersymmetry (QM SUSY) with central extension is investigated. We first show that two different sets of $d+2$ ($d+1$) supercharges for $d=$ even (odd), each of which satisfies an $\mathcal{N}=d+2$ ($d
Externí odkaz:
http://arxiv.org/abs/1812.11282
Publikováno v:
J. Phys. A: Math. Theor. 53 155302 (2020)
We consider the scattering problems of a quantum particle in a system with a single Y-junction and in ring systems with double Y-junctions. We provide new formalism for such quantum mechanical problems. Based on a path integral approach, we find comp
Externí odkaz:
http://arxiv.org/abs/1812.05749
Autor:
Fujimoto, Yukihiro, Hasegawa, Kouhei, Nishiwaki, Kenji, Sakamoto, Makoto, Tatsumi, Kentaro, Ueba, Inori
We investigate a new realization of extended quantum-mechanical supersymmetry. We first show that an $\mathcal{N}=2$ quantum-mechanical supersymmetry is hidden in the four-dimensional (4D) spectrum of the Kaluza-Klein decomposition for the higher dim
Externí odkaz:
http://arxiv.org/abs/1804.02626
Publikováno v:
Phys. Rev. D 97, 115039 (2018)
We propose a new mechanism to produce a fermion mass hierarchy dynamically in a model with a singlet generation of fermions. A five dimensional gauge theory on an interval with point interactions (zero-width branes) takes responsibility for realizing
Externí odkaz:
http://arxiv.org/abs/1709.05693
Publikováno v:
Prog Theor Exp Phys (2017) 2017 (7): 073B03
We investigate a 6d Dirac fermion on a rectangle. It is found that the 4d spectrum is governed by $N=2$ supersymmetric quantum mechanics. Then we demonstrate that the supersymmetry is very useful for classifying all the allowed boundary conditions an
Externí odkaz:
http://arxiv.org/abs/1609.04565
Publikováno v:
Nucl. Phys. B922 (2017) 186-225
We classify possible boundary conditions of a 6d Dirac fermion $\Psi$ on a rectangle under the requirement that the 4d Lorentz structure is maintained, and derive the profiles and spectrum of the zero modes and nonzero KK modes under the two specific
Externí odkaz:
http://arxiv.org/abs/1609.01413
Autor:
Fujimoto, Yukihiro, Kobayashi, Tatsuo, Nishiwaki, Kenji, Sakamoto, Makoto, Tatsuta, Yoshiyuki
Publikováno v:
Phys. Rev. D 94, 035031 (2016)
Based on the result of classification in our previous work, we exhaustively investigate Yukawa sector of $U(8)$ model on magnetized orbifolds $T^{2}/Z_{2}$, $T^{2}/Z_{3}$, $T^{2}/Z_{4}$ and $T^{2}/Z_{6}$ by evaluating ratios of the mass eigenvalues o
Externí odkaz:
http://arxiv.org/abs/1605.00140