116 citations · 1.4k across the 130 of their papers we have counts for
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A Schwinger term in q-deformed su(2) algebra
Kazuo Fujikawa, Harunobu Kubo, C. H. Oh
An extra term generally appears in the q-deformed algebra for the deformation parameter , if one combines the Biedenharn-Macfarlane construction of q-defo…
A toy model of quantum gravity with a quantized cosmological constant
Kazuo Fujikawa
The path integral for the hydrogen atom, for example, is formulated as a one-dimensional quantum gravity coupled to matter fields representing the electron coordinates. The (renorm…
Exact path integral of the hydrogen atom and the Jacobi's principle of least action
Kazuo Fujikawa
The general treatment of a separable Hamiltonian of Liouville-type is well-known in operator formalism. A path integral counterpart is formulated if one starts with the Jacobi's pr…
Physical Implications of a Vector-like Extension of the Standard Model
Kazuo Fujikawa
Physical implications of a vector-like extension of the standard model for heavier quarks and leptons with gauge symmetry and only one Higgs doublet are discusse…
Phase operator problem and an index theorem for Q-deformed oscillator
Kazuo Fujikawa
The notion of index is applied to analyze the phase operator problem associated with the photon. We clarify the absence of the hermitian phase operator on the basis of an index con…
Path integral of the hydrogen atom, the Jacobi's principle of least action and one-dimensional quantum gravity
Kazuo Fujikawa
A path integral evaluation of the Green's function for the hydrogen atom initiated by Duru and Kleinert is studied by recognizing it as a special case of the general treatment of t…