Thermal effects on the stability of excited atoms in cavities

@article{Khanna2009ThermalEO,
  title={Thermal effects on the stability of excited atoms in cavities},
  author={Faqir C. Khanna and Adolfo P. C. Malbouisson and Jorge M{\'a}rio Carvalho Malbouisson and Ademir E Santana},
  journal={Physical Review A},
  year={2009},
  volume={81},
  pages={032119}
}
An atom, coupled linearly to an environment, is considered in a harmonic approximation in thermal equilibrium inside a cavity. The environment is modeled by an infinite set of harmonic oscillators. We employ the notion of dressed states to investigate the time evolution of the atom initially in the first excited level. In a very large cavity (free space) for a long elapsed time, the atom decays and the value of its occupation number is the physically expected one at a given temperature. For a… 
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