Speaker
Yannick Kluth
(University of Toronto)
Description
Evidence for the existence of a UV fixed point in quantum gravity is usually derived using the functional renormalization group. In this talk, I discuss how this fixed point can be found solely using perturbation theory, provided one adopts a suitable renormalization scheme that retains the relevant physics. While the FRG achieves this naturally, I will discuss alternative methods tailored to a perturbative formulation, such as modifications of minimal subtraction in dimensional regularization, or the Ricci flow in quantum gravity. Similarly to the FRG, these methods yield a one-loop fixed point in four-dimensional quantum gravity. I close by discussing the implications of these findings and the connection to FRG results.