141 citations · 926 across the 59 of their papers we have counts for
60 papers
Proof of Spin-Statistics Theorem in Quantum Mechanics of Identical Particles
Takafumi Kita
A nonrelativistic proof of the spin-statistics theorem is given in terms of the field operators satisfying commutation and anticommutation relations, which are introduced here in t…
Hidden Bose-Einstein Singularities in Correlated Electron Systems: III. Thermodynamic Signals
Takafumi Kita
We study thermodynamic consequences of the hidden Bose-Einstein singularities, which have been predicted to cause a pseudogap phase, based on quantum field theory of ordered phases…
Hidden Bose-Einstein Singularities in Correlated Electron Systems: II. Pseudogap Phase in the Weakly Attractive Hubbard Model
Takafumi Kita
The hidden Bose-Einstein singularities of correlated electron systems, whose possible existence has been pointed out in a previous paper based on quantum field theory of ordered ph…
Hidden Bose-Einstein Singularities in Correlated Electron Systems
Takafumi Kita
Hidden singularities in correlated electron systems, which are caused by pair fluctuations of electron-electron or electron-hole bubbles obeying Bose-Einstein statistics, are clari…
How Infrared Singularities Affect Nambu-Goldstone Bosons at Finite Temperatures
Takafumi Kita
Ordered phases realized through broken continuous symmetries embrace long-range order-parameter fluctuations as manifest in the power-law decays of both the transverse and longitud…
Legendre Transformation of the Luttinger-Ward Functional from the Bare Interaction Vertex to the Renormalized One
Takafumi Kita
On the basis of the Luttinger-Ward functional for interacting many-body systems given in terms of full Green's function and the bare interaction vertex , we develop a…