116 citations · 1.4k across the 130 of their papers we have counts for
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Topological properties of Berry's phase
Kazuo Fujikawa
By using a second quantized formulation of level crossing, which does not assume adiabatic approximation, a convenient formula for geometric terms including off-diagonal terms is d…
Quantization of Space-time Noncommutative Theory
Kazuo Fujikawa
General aspects of the quantization of field theories non-local in time are discussed. The path integral on the basis of Schwinger's action principle and the Bjorken-Johnson-Low pr…
Remark on Natural Models of Neutrinos
Kazuo Fujikawa
We comment on what the naturalness argument of 't Hooft implies for a minimal extension of the standard model which incorporates right-handed neutrinos with generic mass terms. If…
Path Integral for Space-time Noncommutative Field Theory
Kazuo Fujikawa
The path integral for space-time noncommutative theory is formulated by means of Schwinger's action principle which is based on the equations of motion and a suitable ansatz of asy…