Seminarium KMMF "Teoria Dwoistości"

In this talk I present an elementary derivation of the celebrated Lee-Huang-Yang formula for Bose gases in the Gross-Pitaevskii Regime, which unifies various approaches that have been developed in recent years. While it is possible to generalize this method in various ways, for example we assume well known bounds on the number of excited particles that could be derived in a self contained way, we will focus on the simplest possible case in order to highlight the conceptual novelties.