Noise and particle condensation

H. Umezawa, Y. Yamanaka

研究成果: Article

8 引用 (Scopus)

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This paper is aimed to clarify the appearance of non-quantum noises in quantum systems in various subjects from a unified viewpoint. Examples taken are the squeezed state in quantum optics, the Hawking radiation around the black hole and thermo field dynamics (TFD) in thermal quantum field theory. Under the use of mathematical formulation of TFD, the origin of noises is traced to the Bogoliubov transformation, i.e., the pair condensation of bare particles in the physical vacua. Detailed analysis of the noise energy reveals a crucial distinction among them: Calling the operator generating the noise energy the noise generator, we find two cases, dynamical and spontaneous, depending on whether the noise generator is part of the Hamiltonian or not. The squeezed state belongs to the former, TFD does to the latter.

元の言語English
ページ(範囲)291-305
ページ数15
ジャーナルPhysica A: Statistical Mechanics and its Applications
170
発行部数2
DOI
出版物ステータスPublished - 1991 1 1
外部発表Yes

ASJC Scopus subject areas

  • Statistics and Probability
  • Condensed Matter Physics

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