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Quantum cosmology and the arrow of timeDOI: 10.1590/S0103-97332005000200014 Abstract: although most fundamental laws are invariant under time reversal, experience exhibits the presence of irreversible phenomena - the arrows of time. their origin lies in cosmology, and i argue that only quantum cosmology can provide the appropriate formal framework. after briefly reviewing the formalism, i discuss how a simple and natural boundary condition can lead to the observed arrows of time. this yields at the same time interesting consequences for black holes.
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