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Macroscopic systems are described most completely by local densities(particle number, momentum and energy) yet the superposition states of suchphysical variables, indicated by the Everett interpretation, are not observed.In order to explain this, it is argued that histories of local number, momentumand energy density are approximately decoherent when coarse-grained oversufficiently large volumes. Decoherence arises directly from the proximity ofthese variables to exactly conserved quantities (which are exactly decoherent),and not from environmentally-induced decoherence. We discuss the approach tolocal equilibrium and the subsequent emergence of hydrodynamic equations forthe local densities. The results are general but we focus on a chain ofoscillators as a specific example in which explicit calculations may be carriedout. We discuss the relationships between environmentally-induced andconservation-induced decoherence and present a unified view of these twomechanisms.

Macroscopic Superpositions, Decoherent Histories and the Emergence of Hydrodynamic Behaviour