Rotating-Wave Approximation and Spontaneous Emission

This is the authors' abstract. We don't add key points for this paper.

Spontaneous emission from two systems, namely, N identical harmonic oscillators and N identical two-level atoms, is studied without the use of the rotating-wave approximation. Certain new features of spontaneous emission, for instance, the dependence of the radiation rate on the initial dipole moment phase, are discussed.