Macroscoping Superpositions, Decoherent Histories, and the Emergence of Hydrodynamic Behaviour (2010)
Macroscopic systems are described most completely by local densities (particle number, momentum, and energy) yet the superposition states of such physical variables, indicated by the Everett interpretation, are not observed. In order to explain this, it is argued that histories of local number, momentum, and energy density are approximately decoherent when coarse-grained over sufficiently large volumes. Decoherence arises directly from the proximity of these variables to exactly conserved quantities (which are exactly decoherent), and not from environmentally induced decoherence. This chapter discusses the approach to local equilibrium and the subsequent emergence of hydrodynamic equations for the local densities. The results are general but the chapter focuses on a chain of oscillators as a specific example in which explicit calculations may be carried out. It discusses the relationships between environmentally-induced and conservation-induced decoherence, and presents a unified view of these two mechanisms.
...MoreBook Saunders, Simon; Barrett, Jonathan; Kent, Adrian; Wallace, David (2010) Many Worlds? Everett, Quantum Theory, & Reality.
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