Fakeons and the classicization of quantum gravity: the FLRW metric

Understand

Under certain assumptions, it is possible to make sense of higher derivative theories by quantizing the unwanted degrees of freedom as fakeons, which are later projected away.

• Then the true classical limit is obtained by classicizing the quantum theory.
• Since quantum field theory is formulated perturbatively, the classicization is also perturbative.
• After deriving a number of properties in a general setting, we consider the theory of quantum gravity that emerges from the fakeon idea and study its classicization, focusing on the FLRW metric.