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12 papers · 1 filter
A Possible Boson Realization of the so(4)- and the so(3,1)-Algebra
S. Nishiyama, C. Providencia, J. da Providencia +2
As natural extensions of the boson realizations of the su(2)- and the su(1,1)-algebra, the so(4)- and the so(3,1)-algebras are presented in the form of boson realizations with four…
A Note on the Eigenvalue Problem in the su(1,1)-Algebra
S. Nishiyama, C. Providencia, J. da Providencia +2
Normalization constant in the eigenstate appearing in the eigenvalue problem of the su(1,1)-algebra is discussed. This normalization constant is expressed in terms of the Gauss' hy…
On the Eigenvalue Problem of the su(1,1)-Algebra and the Coupling Scheme of Two su(1,1)-Spins
S. Nishiyama, C. Providencia, J da Providencia +2
After recapitulating the eigenvalue problem of the su(1,1)-algebra in the conventional form, the same problem is treated in an unconventional form, in which the eigenvalue is pure…
First order phase transition in the quark matter
Masaharu Iwasaki
We investigate chiral phase transition of the first order in the quark matter. Using the Nambu-Jona-Lasinio model, an equation of state of the quark matter which is similar to the…
Amplification of Quantum Meson Modes in the Late Time of Chiral Phase Transition
K. Watanabe, Y. Tsue, S. Nishiyama
It is shown that there exists a possibility of amplification of amplitudes of quantum pion modes with low momenta in the late time of chiral phase transition by using the Gaussian…
Tetraquark particle in the string model
Masaharu Iwasaki, Takahiko Fukutome
We discuss possibility of the existence of tetraquark states made of four quarks in the string (flux tube) model. The new particle is composed of a diquark and an anti-diquark whic…