Abstract
New projection operators are introduced in the theory of two-time Green functions. The self-energy part of the Green function is expressed in terms of the random force whose time development differes from usual one by a factor (1- P ), P being the projection operator. In the case of the Bose system, we obtained the time-relaxation expression for the width function \(\varGamma\)( k , ω) of the dynamical structure factor, which satisfies the sum rule by Puff.
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