Abstract
In many problems of molecular physics of condensed matter the coupling V of the system of interest with its environment is strong. During a time interval of the order of the characteristic relaxation time ΓTy due to V, both the energy spectrum and the time evolution of the system cannot be determined exactly. A new representation is introduced in which the coupling V does not affect the energy spectrum, but it determines the time evolution. This causes the appearance of a new quantity ΓT, called “intrinsic time.” Some results of this procedure are (a) invariance of the basic physical equations under the new trnsformation, (b) noncommutation of ΓT with the Liouvillian, and (c) existence of a nonvanishing “entropy production” with respect to the intrinsic time.
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