2 papers
math-ph2025
The Spectral Renormalization Flow Based on the Smooth Feshbach--Schur Map: The Introduction of the Semi-Group Property
Volker Bach, Miguel Ballesteros, Jakob Geisler
The spectral renormalization method is a powerful mathematical tool that is prominently used in spectral theory in the context of low-energy quantum field theory and its original i…
math-ph2022
Absence of submultiplicative norms for Wick-ordered Operator Products
Jakob Geisler
In this paper, a key problem of the rigorous formulation of the renormalization group as a continuous flow is identified. Some essential features of the operator-theoretic renormal…