title: Hidden gauge structure and derivation of microcanonical ensemble theory of bosons from quantum principles.
abstract: Microcanonical ensemble theory of free bosons is derived from quantum mechanics by making use of the hidden gauge structure. The relative phase interaction associated with this gauge structure, described by the Pegg-Barnett formalism, is shown to lead to perfect decoherence in the thermodynamic limit and the principle of equal a priori probability, simultaneously.
authors.affiliation: Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Sumiyoshi
authors.initials: S
authors.lastname: Abe
authors.forename: Tsunehiro
authors.initials: T
authors.lastname: Kobayashi