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A model quantum cosmology is used to illustrate how arrows of time emerge ina universe governed by a time-neutral dynamical theory constrained by timeasymmetric initial and final boundary conditions represented by initial andfinal density matrices. In a quantum universe universe arrows of time aredescribed by the probabilities of appropriately coarse grained sets ofhistories of quantities like entropy that grow or decay. We show that therequirement of that these sets of histories decohere implies two things: (1) Atime asymmetry between initial and final conditions that is a basis for arrowsot time. (2) How a final state of indifference that is represented by a finaldensity matrix proportional to the unit density matrix is consistent withcausality, and allows a finer-grained description of the model universe interms of decoherent histories than any other final state.

Arrows of Time and Initial and Final Conditions in the Quantum Mechanics of Closed Systems Like the Universe