Výsledky vyhledávání - "Yamamura, Masatoshi"

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Spin polarization and color superconductivity in the Nambu--Jona-Lasinio model at finite temperature

Autor: Matsuoka, Hiroaki, Tsue, Yasuhiko, da Providencia, Joao, Providencia, Constancia, Yamamura, Masatoshi

Publikováno v: Phys. Rev. D 95, 054025 (2017)

We investigate the possible existence of spin polarization and color superconductivity in the Nambu--Jona-Lasinio model with a tensor-type interaction at finite density and temperature. The thermodynamic potential is calculated by the functional inte

Externí odkaz: http://arxiv.org/abs/1611.02394

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Spin polarization in high density quark matter under a strong external magnetic field

Autor: Tsue, Yasuhiko, da Providencia, Joao, Providencia, Constanca, Yamamura, Masatoshi, Bohr, Henrik

In high density quark matter under a strong external magnetic field, possible phases are investigated by using the two-flavor Nambu-Jona-Lasinio model with tensor-type four-point interaction between quarks, as well as the axial-vector-type four-point

Externí odkaz: http://arxiv.org/abs/1607.01863

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A possible framework of the Lipkin model obeying the su(n)-algebra in arbitrary fermion number. II --- Two subalgebras in the su(n)-Lipkin model and an approach to the construction of linearly independent basis ---

Autor: Tsue, Yasuhiko, Providencia, Constanca, da Providencia, Joao, Yamamura, Masatoshi

Standing on the results for the minimum weight states obtained in the previous paper (I), an idea how to construct the linearly independent basis is proposed for the su(n)-Lipkin model. This idea starts in setting up m independent su(2)-subalgebras i

Externí odkaz: http://arxiv.org/abs/1605.06880

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A possible framework of the Lipkin model obeying the su(n)-algebra in arbitrary fermion number. I --- The su(2)-algebras extended from the conventional fermion-pair and determination of the minimum weight states ---

Autor: Tsue, Yasuhiko, Providencia, Constanca, da Providencia, Joao, Yamamura, Masatoshi

The minimum weight states of the Lipkin model consisting of n single-particle levels and obeying the su(n)-algebra are investigated systematically. The basic idea is to use the su(2)-algebra which is independent of the su(n)-algebra. This idea has be

Externí odkaz: http://arxiv.org/abs/1508.07672

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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

Autor: Tsue, Yasuhiko, Providencia, Constanca, da Providencia, Joao, Yamamura, Masatoshi

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 constructed by the Schwinger boson representation of the su(1,1)-algebra. Some o

Externí odkaz: http://arxiv.org/abs/1409.3628

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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

Autor: Tsue, Yasuhiko, Providencia, Constanca, da Providencia, Joao, Yamamura, Masatoshi

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 the present authors. It forms a striking contrast to the Schwinger boson

Externí odkaz: http://arxiv.org/abs/1409.3626

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The Bonn nuclear quark model revisited

Autor: Providência, Constança, da Providência, João, Cordeiro, Flávio, Yamamura, Masatoshi, Tsue, Yasuhiko, Nishiyama, Seiya

Publikováno v: Annals Phys.324:1666-1675,2009

We present the exact solutions to the equations of the lowest energy states of the colored and color-symmetric sectors of the Bonn quark model, which is SU(3) symmetric and is defined in terms of an effective pairing force with $su(4)$ algebraic stru

Externí odkaz: http://arxiv.org/abs/0909.3072

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