L. Lanz et O. Melsheimer, TOWARDS AN OBJECTIVE QUANTUM PHYSICS, Nuovo cimento della Societa italiana di fisica. B, Relativity, classical and statistical physics, 108(5), 1993, pp. 511-539
For a macrosystem a general formalism is given, inside quantum field t
heory, to describe its separation from the surrounding and its time ev
olution. Assuming a suitable dissipative behaviour of the time evoluti
on of the separated system, an objective quantum description is extrac
ted from quantum field theory, based on a natural set of non-local hid
den variables. In the non-relativistic case, compatibility with usual
statistical mechanics is discussed in the context of a Boltzmann descr
iption; finally, the coherence is shown with the point of view of Bohr
about quantum mechanics of a microsystem.