Generalized thermo vacuum state derived by the partial trace method
arXiv:0904.4297 · doi:10.1088/0256-307X/26/9/090307
Abstract
By virtue of the technique of integration within an ordered product (IWOP) of operators we present a new approach for deriving generalized thermo vacuum state which is simpler in form that the result by using the Umezawa-Takahashi approach, in this way the thermo field dynamics can be developed. Applications of the new state are discussed.
5 pages, no figure, revtex4