Classicality via hydrodynamics in quantum field theory
arXiv:gr-qc/9805074
Abstract
Motivated by the consistent histories approach to quantum mechanics, we examine a simple model of hydrodynamic coarse-graining for a scalar field. It consists in averaging the field over spatial regions of size L and constructing the evolution equation for the coarse grained quantities, thus identifying dissipation and noise.
17 pages, LATEX