S-matrix theory and the density matrix formalism |
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Authors: | M. Roberts W.E. Hagston |
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Affiliation: | Physics Department , University of Hull , Hull, HU6 7RX, U.K. |
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Abstract: | A general equation governing the time development of the diagonal part of the density matrix is proposed for weakly interacting systems possessing no off-diagonal long range order. This equation, which involves generalized Møller operators of the type employed in S-matrix theory, is solved for two cases and leads to the generalized Pauli and Boltzmann equations. |
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