Modul: MAT675 PDE and Mathematical Physics

## Beliaev damping in Bose gas

Talk by Prof. Dr. Marcin Napiórkowski

Speaker invited by: Prof. Dr. Benjamin Schlein

**Date:** 28.03.24 **Time:** 16.15 - 18.00 **Room:** Y27H46

According to the Bogoliubov theory, the low energy behaviour of the Bose gas at zero temperature can be described by non-interacting bosonic quasiparticles called phonons. In my talk I will explain how the damping rate of phonons at low momenta, the so-called Beliaev damping, can be computed with simple arguments involving an effective Friedrichs model for phonons.''