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pro vyhledávání: '"Yamanaka, Y"'
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 this, Thermo Field Dynamics is used. We then describe the most general
Externí odkaz:
http://arxiv.org/abs/2105.11913
Publikováno v:
Progress of Theoretical and Experimental Physics 2020 April issue published
For more than half a century, the structure of $^{12}$C, such as the ground band, has been understood to be well described by the three $\alpha$ cluster model based on a geometrical crystalline picture. On the contrary, recently it has been claimed t
Externí odkaz:
http://arxiv.org/abs/1910.08400
Akademický článek
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Publikováno v:
Phys. Rev. C 98, 044303 (2018)
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 phase transition from the Wigner phase to the Nambu-Goldstone phase is
Externí odkaz:
http://arxiv.org/abs/1805.12255
Publikováno v:
In Physica A: Statistical Mechanics and its Applications 1 April 2022 591
The renormalization conditions of inhomogeneous systems of a quantum field under an external potential are studied, for both equilibrium and nonequilibrium scenarios and based on Thermo Field Dynamics. Extending the concept of the on-shell self-energ
Externí odkaz:
http://arxiv.org/abs/1707.05598
The formulation for zero mode of a Bose-Einstein condensate beyond the Bogoliubov approximation at zero temperature [Y.Nakamura et al., Phys. Rev. A 89, 013613 (2014)] is extended to finite temperature. Both thermal and quantum fluctuations are consi
Externí odkaz:
http://arxiv.org/abs/1604.05900
Publikováno v:
Phys. Rev. A 93, 043622 (2016)
The dynamical instability of weakly interacting two-component Bose--Einstein condensates with coaxial quantized vortices is analytically investigated in a two-dimensional isotopic harmonic potential. We examine whether complex eigenvalues appear on t
Externí odkaz:
http://arxiv.org/abs/1603.02450
Publikováno v:
Phys. Rev. A 92, 023627 (2015)
To formulate the zero modes in a finite-size system with spontaneous breakdown of symmetries in quantum field theory is not trivial, for in the naive Bogoliubov theory, one encounters difficulties such as phase diffusion, the absence of a definite cr
Externí odkaz:
http://arxiv.org/abs/1504.06420
Publikováno v:
Phys. Rev. C 94, 014314 (2016)
An effective field theory of $\alpha$ cluster condensation is formulated as a spontaneously broken symmetry in quantum field theory to understand the raison d'etre and nature of the Hoyle and $\alpha$ cluster states in $^{12}$C. The Nambu--Goldstone
Externí odkaz:
http://arxiv.org/abs/1411.6353