Speaker
Shunsuke Yabunaka
Description
We study the tetracritical fixed point in O(N) models with NPRG. Increasing N, we find that the tetracritical FP continues to exist up to N=\infty, which is a different scenario from what we found for the tricritical FP. The FP approaches the WF FP except at a field value. We actually find that higher derivatives of the FP potential at the special point becomes singular in a way that the FP cannot be found with conventional large N analysis.
