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From Quantum Dynamics to the Canonical Distribution: General Picture and a Rigorous Example

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Tasaki, Hal·1998·Physical Review Letters

Abstract

Derivation of the canonical (or Boltzmann) distribution based only on quantum dynamics is discussed. Consider a closed system which consists of a mutually interacting subsystem and a heat bath, and assume that the whole system is initially in a pure state (which can be far from equilibrium) with small energy fluctuation. Under the ``hypothesis of equal weights for eigenstates,'' we derive the canonical distribution in the sense that, at sufficiently large and typical time, the (instantaneous) quantum mechanical expectation value of an arbitrary operator of the subsystem is almost equal to the desired canonical expectation value. We present a class of examples in which the above derivation can be rigorously established without any unproven hypotheses.

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Metadata

Authors
Tasaki, H.
Venue
Physical Review Letters
Published
1998-02-16
Volume
80
Issue
7
Pages
1373-1376
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W2093300793
Cited by
425
References
9
FWCI
1.42
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: From Quantum Dynamics to the Canonical Distribution: General Picture and a Rigorous Example. https://app.cochat.ai/papers/10.1103/physrevlett.80.1373
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Tasaki, H. (1998). From Quantum Dynamics to the Canonical Distribution: General Picture and a Rigorous Example. Physical Review Letters. https://doi.org/10.1103/physrevlett.80.1373

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