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13 papers · 1 filter
Bose-Einstein condensation and density collapse in a weakly coupled boson-fermion mixture
Kyoko Shirasaki, Eiji Nakano, Hiroyuki Yabu
We investigate the mechanical instability toward density collapse and the transition temperature of Bose-Einstein condensation in the weakly coupled boson-fermion many-body mixture…
Energy and mass-number dependence of hadron-nucleus total reaction cross sections
Akihisa Kohama, Kei Iida, Kazuhiro Oyamatsu
We systematically analyze nuclear reaction data that are sensitive to nuclear size, namely, proton-nucleus total reaction cross sections and differential elastic cross sections, us…
Effective field theory of Bose-Einstein condensation of clusters and Nambu-Goldstone-Higgs states in C
Y. Nakamura, J. Takahashi, Y. Yamanaka +1
An effective field theory of cluster condensation is formulated as a spontaneously broken symmetry in quantum field theory to understand the raison d'etre and nature of the Hoy…
Beyond the Schwinger boson representation of the su(2)-algebra. II -- Some theoretical features of new boson representation and connections to the other boson representations
Yasuhiko Tsue, Constanca Providencia, Joao da Providencia +1
Concerning the new boson representation presented in Part I, it is proved that this representation obeys the su(2)-algebra in a certain subspace in the whole boson space constructe…
Beyond the Schwinger boson representation of the su(2)-algebra. I -- New boson representation based on the su(1,1)-algebra and its related problems with application
Yasuhiko Tsue, Constanca Providencia, Joao da Providencia +1
With the use of two kinds of boson operators, a new boson representation of the su(2)-algebra is proposed. The basic idea comes from the pseudo su(1,1)-algebra recently given by th…
Spin Polarization versus Color-Flavor-Locking in High Density Quark Matter
Y. Tsue, J. da Providencia, C. Providencia +2
It is shown that spin polarization with respect to each flavor in three-flavor quark matter occurs instead of the color-flavor locking at high baryon density by using the Nambu-Jon…