NOISE AND PARTICLE CONDENSATION

被引:8
作者
UMEZAWA, H
YAMANAKA, Y
机构
[1] The Theoretical Physics Institute, University of Alberta, Edmonton
来源
PHYSICA A | 1991年 / 170卷 / 02期
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/0378-4371(91)90047-G
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
引用
收藏
页码:291 / 305
页数:15
相关论文
共 24 条
[1]   OBTAINMENT OF THERMAL NOISE FROM A PURE QUANTUM STATE - COMMENT [J].
BARNETT, SM ;
KNIGHT, PL .
PHYSICAL REVIEW A, 1988, 38 (03) :1657-1658
[2]   THERMOFIELD ANALYSIS OF SQUEEZING AND STATISTICAL MIXTURES IN QUANTUM OPTICS [J].
BARNETT, SM ;
KNIGHT, PL .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 1985, 2 (03) :467-479
[3]   THERMAL QUASIPARTICLES WITH PHASE-SPACE DISTRIBUTION [J].
BERMAN, M .
PHYSICAL REVIEW A, 1989, 40 (04) :2057-2063
[4]  
CHATURVEDI S, 1989, OPERATOR METHODS MAS
[5]   FINITE-TEMPERATURE FIELD-THEORY AND QUANTUM NOISE IN AN ELECTRICAL NETWORK [J].
GARAVAGLIA, T .
PHYSICAL REVIEW A, 1988, 38 (08) :4365-4368
[6]   FINITE TEMPERATURE-FIELD THEORY AND QUANTUM NOISE IN INDUCTIVELY COUPLED LRC CIRCUITS [J].
GARAVAGLIA, T .
PHYSICS LETTERS A, 1988, 131 (03) :151-155
[7]  
HAN D, 1990, LORENTZ SQUEEZED HAD
[8]   THERMODYNAMICS AND QUANTUM-FIELD THEORY [J].
HARDMAN, I ;
UMEZAWA, H ;
YAMANAKA, Y .
PHYSICS LETTERS A, 1990, 146 (06) :293-298
[9]  
HARDMAN I, 1989, THERMAL ENERGY QUANT
[10]   THERMO-FIELD DYNAMICS OF BLACK-HOLES [J].
ISRAEL, W .
PHYSICS LETTERS A, 1976, 57 (02) :107-110