The Kubo theory of linear response is extended with respect to reference states, being excited far off equilibrium. Using the time dependent projector technique, generalized response functions are introduced. The structure of the corresponding evolution equations is mainly determined by the...

A dynamical model for the collapse of the wave function in a quantum measurement process is proposed by considering the interaction of a quantum system (spin -12) with a macroscopic quantum apparatus interacting with an environment in a dissipative manner. The dissipative interaction leads to...