Event info

Date: Wednesday, 8 April 2026 16:45 - 17:45

Place: IMI Auditorium(W1-D-413) and Live streaming with Zoom

Speaker: Hiroshi Suzuki (Faculty of Science, Kyushu University)

Title : Exact renormalization group with manifest gauge symmetry and its application to quantum electrodynamics

Abstract:
The exact renormalization group formulated by Kenneth Wilson serves not only as a tool for analyzing critical phenomena in statistical systems, but also as a framework for constructing quantum field theories in continuous spacetime through the continuum limit around renormalization group fixed points. Traditionally, particle physics has been built upon quantum field theories defined around the Gaussian fixed point that can be analyzed in perturbation theory. However, there isconsiderable interest in the possibility of employing quantum field theories based on non-perturbative fixed points, which cannot be accessed by perturbation theory, in particle physics.

A central challenge in this context is that the conventional exact renormalization group does not manifestly preserve gauge symmetry, which underlies particle physics theories. In this talk, we explain the Gradient Flow Exact Renormalization Group that we have formulated to maintain gauge symmetry manifestly. We then present its application to quantum electrodynamics, the simplest gauge theory.

IMI Colloquium Organizers
IKEMATSU, Yasuhiko <ikematsu@imi.kyushu-u.ac.jp>
KURATA, Sumito <kurata@imi.kyushu-u.ac.jp>
TAGAMI, Daisuke <tagami@imi.kyushu-u.ac.jp>