23 citations · 155 across the 29 of their papers we have counts for
29 papers
Nonequilibrium Thermo Field Dynamics Using 4x4-Matrix Transformation for System with Bose--Einstein Condensation
T. Oyama, Y. Nakamura, Y. Yamanaka
This study aims to construct a theoretical formulation of a nonequilibrium process for a system of Bose--Einstein condensate associated with a spontaneous symmetry breakdown. For t…
Supersolidity of the cluster structure in the nucleus C
S. Ohkubo, J. Takahashi, Y. Yamanaka
For more than half a century, the structure of C, such as the ground band, has been understood to be well described by the three cluster model based on a geometrical cry…
Bose-Einstein condensation of dilute alpha clusters above four threshold in O in field theoretical superfluid cluster model
Junichi Takahashi, Yoshiya Yamanaka, Shigeru Ohkubo
Observed well-developed cluster states in O, located above the four threshold, are investigated from the viewpoint of Bose-Einstein condensation of clusters by u…
Dynamical properties of the finite-size Dicke model coupled to a thermal reservoir
Ryosuke Imai, Yoshiya Yamanaka
We investigate the dynamical properties of the finite-size Dicke model coupled to a photon reservoir in the dispersive regime. The system-reservoir coupling in our Hamiltonian incl…
Bose-Einstein condensation of alpha clusters and new soft mode in 12C--52Fe 4N nuclei in field theoretical superfluid cluster model
R. Katsuragi, Y. Kazama, J. Takahashi +3
Bose-Einstein condensation of alpha clusters in light and medium-heavy nuclei is studied in the frame of the field theoretical superfluid cluster model. The order parameter of the…
Stability of Symmetry Breaking States in Finite-size Dicke Model with Photon Leakage
Ryosuke Imai, Yoshiya Yamanaka
We investigate the finite-size Dicke model with photon leakage. It is shown that the symmetry breaking states, which are characterized by non-vanishing $\langle \hat{a} \rangle \ne…