Finite-temperature electromagnetic-field quantization in a medium: The thermofield approach

被引：3
|
作者：
Kheirandish, F. [1 ]
Soltani, M. [1 ]
Jafari, M. [1 ]
机构：
[1] Univ Isfahan, Dept Phys, Fac Sci, Esfahan 8174673441, Iran
来源：
PHYSICAL REVIEW A | 2011年 / 84卷 / 06期
关键词：
QUANTUM; DYNAMICS; SYSTEMS; GAUGE; LAW;
D O I：
10.1103/PhysRevA.84.062120
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Starting from a Lagrangian, an electromagnetic field is quantized in the presence of a medium in thermal equilibrium and also in a medium with time-varying temperature. The vector potential for both equilibrium and nonequilibrium cases is obtained and vacuum fluctuations of the fields are calculated. As an illustrative example, the finite-temperature decay rate and level shift of an atom in a polarizable medium are calculated in this approach.
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