Zusammenfassung
After a pedagogical introduction to the concept of resonance in classical and
quantum mechanics, some interesting applications are discussed. The subject
includes resonances occurring as one of the effects of radiative reaction, the
resonances involved in the refraction of electromagnetic waves by a medium with
a complex refractive index, and quantum decaying systems described in terms of
resonant states of the energy. Some useful mathematical approaches like the
Fourier transform, the complex scaling method and the Darboux transformation
are also reviewed.
