The Friedrichs Model and its use in resonance phenomena

Understand

We present here a relation of different types of Friedrichs models and their use in the description and comprehension of resonance phenomena.

• We first discuss the basic Friedrichs model and obtain its resonance in the case that this is simple or doubly degenerated.
• Next, we discuss the model with $N$ levels and show how the probability amplitude has an oscillatory behavior.
• Two generalizations of the Friedrichs model are suitable to introduce resonance behavior in quantum field theory.