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190 papers · 1 filter
Cosmic Shells
Y. Hosotani, T. Nakajima, R. G. Daghigh +1
When a potential for a scalar field has two local minima there arise spherical shell-type solutions of the classical field equations due to gravitational attraction. We establish s…
QED-SCF, MCSCF and Coupled-cluster Methods in Quantum Chemistry
Tadafumi Ohsaku, Kizashi Yamaguchi
We investigate the method to combine the techniques of quantum chemisty with QED. In our theory, we treat the N-electron system and the Dirac sea on an equal footing; we regard bot…
Quantum Electrodynamical Density-matrix Functional Theory and Group-theoretical Consideration of its Solution
Tadafumi Ohsaku, Shusuke Yamanaka, Daisuke Yamaki +1
For studying the group theoretical classification of the solutions of the density functional theory in relativistic framework, we propose quantum electrodynamical density-matrix fu…
BCS and generalized BCS superconductivity in relativistic quantum field theory. I. formulation
Tadafumi Ohsaku
We investigate the BCS and generalized BCS theories in the relativistic quantum field theory. We select the gauge freedom as U(1), and introduce a BCS-type effective attractive int…
Quasiparticle Excitation in the Superconducting Pyrochlore Cd2Re2O7 Probed by Muon Spin Rotation
R. Kadono, W. Higemoto, A. Koda +3
The quasiparticle excitations in the mixed state of Cd2Re2O7 have been studied by means of muon spin rotation/relaxation. The temperature dependence of the magnetic penetration dep…
Transient electric current through an Aharonov-Bohm ring after switching of a Two-Level-System
Gen Tatara
Response of the electronic current through an Aharonov-Bohm ring after a two-level-system is switched on is calculated perturbatively by use of non-equilibrium Green function. In t…