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H. Dieter Zeh
H. Dieter Zeh is one of the founders of the idea of decoherence.
Zeh taught a course on the direction of time over the past few decades at Heidelberg University. The course has been published in a textbook, The Physical Basis of the Direction of Time, that has gone through five editions.
Zermelo's Recurrence Objection to the HTheorem
In the latest edition of his text, Zeh discusses Ernst Zermelo's recurrence objection to Ludwig Boltzmann's HTheorem and suggests that the timedependence of the size of the whole universe prevents such a recurrence. Another argument against the statistical interpretation of irreversibility, the recurrence objection (or Wiederkehreinwand), was raised much later by Ernst Friedrich Zermelo, a collaborator of Max Planck at a time when the latter still opposed atomism, and instead supported the 'energeticists', who attempted to understand energy and entropy as fundamental 'substances'. This argument is based on a mathematical theorem due to Henri Poincaré, which states that every bounded mechanical system will return as close as one wishes to its initial state within a sufficiently large time. The entropy of a closed system would therefore have to return to its former value, provided only the function F(z) is continuous. This is a special case of the quasiergodic theorem which asserts that every system will corne arbitrarily close to any point on the hypersurface of fixed energy (and possibly with other fixed analytical constants of the motion) within finite time.In a 1993 response to an article by Nicholas Gisin entitled "Wavefunction approach to dissipative processes: are there quantum jumps?," Zeh argued that "quantum jumps" ("collapses" of the wave function) are only "apparent." Their appearance is caused by the loss of shielding from the environment, which "continuously monitors" a quantum system. Zeh's work seems inspired by two 1952 articles by Erwin Schrödinger titled "Are There Quantum Jumps?" (Part I and Part II) and perhaps by John Bell's 1987 article with the same title. Max Born replied to the Schrödinger claims, defending his statistical interpretation of quantum mechanics. Here is Zeh's position: As far as is known, all properties of closed quantum systems are perfectly described by means of wave functions in configuration space (in general, wave functionals of certain fields) dynamically evolving smoothly according to the timedependent Schrödinger equation. However, the condition of being closed (or shielded against interactions with the environment) can easily be estimated to be quite exceptional. It characterizes very special (usually atomic) systems from which the laws of quantum mechanics were derived. When the shielding ceases, most notably during measurements, discontinuous events ('quantum jumps' or a 'collapse of the wave function') seem to occur, and particle aspects seem to be observed. Such events are also known to lead to a loss of interference between different values of the 'measured' variables  regardless of whether any result is read from the apparatus by an observer.
Works
There are no Quantum Jumps,
nor are there Particles!, Physics Letters A, 172.4 (1993): 189192. (PDF)
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