TY - JOUR
T1 - Thermal degree of freedom in thermo field dynamics
AU - Umezawa, H.
AU - Yamanaka, Y.
N1 - Funding Information:
work was supported by NSERC,
PY - 1991/5/6
Y1 - 1991/5/6
N2 - The view of the thermal degree of freedom for the quantum field system, using the language of thermo field dynamics, is elaborated in this paper: the thermal degree of freedom is the degree of freedom to move through degenerate thermal vacua associated with spontaneous breakdown of a certain symmetry (Ĝ-symmetry). Based on this view, we study a quasi-particle picture, in which the Ĝ-transformation becomes the thermal Bogoliubov transformation.
AB - The view of the thermal degree of freedom for the quantum field system, using the language of thermo field dynamics, is elaborated in this paper: the thermal degree of freedom is the degree of freedom to move through degenerate thermal vacua associated with spontaneous breakdown of a certain symmetry (Ĝ-symmetry). Based on this view, we study a quasi-particle picture, in which the Ĝ-transformation becomes the thermal Bogoliubov transformation.
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U2 - 10.1016/0375-9601(91)90568-S
DO - 10.1016/0375-9601(91)90568-S
M3 - Article
AN - SCOPUS:0011355449
SN - 0375-9601
VL - 155
SP - 75
EP - 82
JO - Physics Letters A
JF - Physics Letters A
IS - 2-3
ER -