3 papers
nucl-th2025
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…
nucl-th2025
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…
nucl-th2023
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…