On p. 28 of Bertrand Delamotte's Introduction to the Nonperturbative Renormalization Group he writes $k$ [the renormalization scale] acts as an infrared regulator (for $k \neq 0$) somewhat similar to a box of finite size $\sim k^{−1}$. Thus, for $k > 0$, there is no phase transition and thus ...

I'm interested in studying what can be derived from string theory that there is in standard model, what is missing and stuff like this. can you suggest a reading?