29 citations · 234 across the 29 of their papers we have counts for
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Inhomogeneous transformations in a gauged twistor formulation of a massive particle
Shinichi Deguchi, Satoshi Okano
In this paper, we show that the mass-shell constraints in the gauged twistor formulation of a massive particle given in [Deguchi and Okano, Phys. Rev. D 93, 045016 (2016) [Erratum…
A new magnetic monopole inspired by Berry's phase
Shinichi Deguchi, Kazuo Fujikawa
A new static and azimuthally symmetric magnetic monopolelike object, which looks like a Dirac monopole when seen from far away but smoothly changes to a dipole near the monopole po…
Topology change from a monopole to a dipole in Berry's phase
Shinichi Deguchi, Kazuo Fujikawa
The smooth topology change of Berry's phase from a Dirac monopole-like configuration to a dipole configuration, when one approaches the monopole position in the parameter space, is…
No anomalous canonical commutators induced by Berry's phase
Shinichi Deguchi, Kazuo Fujikawa
The monopole-like singularity of Berry's adiabatic phase in momentum space and associated anomalous Poisson brackets have been recently discussed in various fields. With the help o…
Twistor formulation of a massive particle with rigidity
Shinichi Deguchi, Takafumi Suzuki
A massive rigid particle model in dimensions is reformulated in terms of twistors. Beginning with a first-order Lagrangian, we establish a twistor representation of the Lag…
A no-go theorem for the -twistor description of a massive particle
Satoshi Okano, Shinichi Deguchi
It is proved that the -twistor expression of a particle's four-momentum vector reduces, by a unitary transformation, to the two-twistor expression for a massive particle or the…
Maximal Abelian gauge and a generalized BRST transformation
Shinichi Deguchi, Vipul Kumar Pandey, Bhabani Prasad Mandal
We apply a generalized Becchi-Rouet-Stora-Tyutin (BRST) formulation to establish a connection between the gauge-fixed Yang-Mills (YM) theories formulated in the Lorenz gaug…
Gauged twistor formulation of a massive spinning particle in four dimensions
Shinichi Deguchi, Satoshi Okano
We present a gauged twistor model of a free massive spinning particle in four-dimensional Minkowski space. This model is governed by an action, referred to here as the gauged gener…
Spinor and twistor formulations of massless particles with rigidity
Shinichi Deguchi, Takafumi Suzuki
The 4-dimensional model of a massless particle with rigidity whose Lagrangian is proportional to its world-line curvature is reformulated in terms of spinor and twistor variables.…
Canonical formalism and quantization of a massless spinning bosonic particle in four dimensions
Shinichi Deguchi, Shouma Negishi, Satoshi Okano +1
A twistor model of a free massless spinning particle in 4-dimensional Minkowski space is studied in terms of spacetime and spinor variables. This model is specified by a simple act…
(Pre-)Hilbert spaces in twistor quantization
Shinichi Deguchi, Jun-ichi Note
In twistor theory, the canonical quantization procedure, called twistor quantization, is performed with the twistor operators represented as \hat{Z}^{A}=Z^{A}(\in C) and \hat{\bar{…
Spinor and Twistor Formulations of Tensionless Bosonic Strings in Four Dimensions
Shinichi Deguchi, Takeshi Egami, Jun-ichi Note
Spinor and twistor formulations of tensionless bosonic strings in 4-dimensional Minkowski space are constructed. We begin with a first-order action that is equivalent to the Nambu-…
A Superspace formulation of Yang-Mills theory on sphere
Rabin Banerjee, Shinichi Deguchi
A superspace approach to the Becchi-Rouet-Stora-Tyutin (BRST) formalism for the Yang-Mills theory on an n-dimensional unit sphere, S_1^{n}, is developed in a manifestly covariant m…
Canonical Formalism for a 2n-Dimensional Model with Topological Mass Generation
Shinichi Deguchi
The four-dimensional model with topological mass generation that was found by Dvali, Jackiw and Pi has recently been generalized to any even number of dimensions (2n-dimensions) in…
2n-Dimensional Models with Topological Mass Generation
Shinichi Deguchi, Satoshi Hayakawa
The 4-dimensional model with topological mass generation that has recently been presented by Dvali, Jackiw and Pi [G. Dvali, R. Jackiw, and S.-Y. Pi, Phys. Rev. Lett. 96, 081602 (2…
Atiyah-Singer Index Theorem in an SO(3) Yang-Mills-Higgs system and derivation of a charge quantization condition
Shinichi Deguchi
The Atiyah-Singer index theorem is generalized to a two-dimensional SO(3) Yang-Mills-Higgs (YMH) system. The generalized theorem is proven by using the heat kernel method and a non…
Charge quantization conditions based on the Atiyah--Singer index theorem
Shinichi Deguchi, Kaoru Kitsukawa
Dirac's quantization condition, (), and Schwinger's quantization condition, (), for an electric charge and a magnetic charge are…
A BRST gauge-fixing procedure for Yang-Mills theory on sphere
Rabin Banerjee, Shinichi Deguchi
A gauge-fixing procedure for the Yang-Mills theory on an n-dimensional sphere (or a hypersphere) is discussed in a systematic manner. We claim that Adler's gauge-fixing condition u…
Second quantized formulation of geometric phases
Shinichi Deguchi, Kazuo Fujikawa
The level crossing problem and associated geometric terms are neatly formulated by the second quantized formulation. This formulation exhibits a hidden local gauge symmetry related…
Abelian Projection of Massive SU(2) Yang-Mills Theory
Shinichi Deguchi, Yousuke Kokubo
We derive an effective Abelian gauge theory (EAGT) of a modified SU(2) Yang-Mills theory. The modification is made by explicitly introducing mass terms of the off-diagonal gluon fi…
Quantization of massive Abelian antisymmetric tensor field and linear potential
Shinichi Deguchi, Yousuke Kokubo
We discuss a quantum-theoretical aspect of the massive Abelian antisymmetric tensor gauge theory with antisymmetric tensor current. To this end, an Abelian rank-2 antisymmetric ten…
A superspace formulation of Abelian antisymmetric tensor gauge theory
Shinichi Deguchi, Bhabani Prasad Mandal
We apply a superspace formulation to the four-dimensional gauge theory of a massless Abelian antisymmetric tensor field of rank 2. The theory is formulated in a six-dimensional sup…
A Universal Lagrangian for Massive Yang-Mills Theories without Higgs Bosons
Shinichi Deguchi
A universal Lagrangian that defines various four-dimensional massive Yang-Mills theories without Higgs bosons is presented. Each of the theories is characterized by a constant k co…
Anomalous Gauge Theories with Antisymmetric Tensor Fields
Shinichi Deguchi, Tomoaki Mukai, Tadahito Nakajima
We derive a dual theory of the four-dimensional anomalous U(1) gauge theory with a Wess--Zumino (WZ) term and with a Stückelberg type mass term by means of a duality transformation…