Renormalization: an advanced overview

Understand

We present several approaches to renormalization in QFT: the multi-scale analysis in perturbative renormalization, the functional methods \`a la Wetterich equation, and the loop-vertex expansion in non-perturbative renormalization.

• While each of these is quite well-established, they go beyond standard QFT textbook material, and may be little-known to specialists of each other approach.
• This review is aimed at bridging this gap.