3 citations · 3 across the 5 of their papers we have counts for
5 papers
Proper derivation of subspace mapping from whole space mapping in boson expansion theory
Kimikazu Taniguchi
The norm operator method, which was recently proposed as a new formulation of the boson expansion theory (BET), is used to show that the subspace mapping is properly derived from t…
On the mapping after and before truncation in the boson expansion theory
Kimikazu Taniguchi
Using the norm operator method, which extends and corrects the conventional boson expansion theories, we investigate two boson mappings of the boson expansion theory, the so-called…
A new boson expansion theory utilizing a norm operator
Kimikazu Taniguchi
We propose a new boson expansion method using a norm operator. The small parameter expansion, in which the boson approximation becomes the zeroth-order approximation, requires the…
Norm operator method for boson expansions
Kimikazu Taniguchi
We propose a new boson expansion theory that does not premise the closed-algebra approximation, indispensable for formulation until now, as an extension of the conventional practic…
On the Approximation in the Hermitian Treatment of Dyson Boson Expansion Theory
Atsushi Kajiyama, Kimikazu Taniguchi, Yoshinao Miyanishi
We discuss about the Hermitian treatment of Dyson-type boson expansion theory. We show that the basic assumption of the conventional treatment does not hold in general and the meth…