Speaker
Description
In this work, we investigate aspects of resurgence in quantum electrodynamics (QED) in strong external background fields. Resurgence provides a framework for understanding how divergent perturbative series can be related to non-perturbative contributions. In particular, we study the vacuum polarization tensor and the mass operator, or electron self-energy, in a self-dual background field in Minkowski spacetime. This topic is especially relevant in strong-field regimes, where conventional perturbative expansions may break down, as suggested by the Ritus-Narozhny conjecture. In addition, we explore how this investigation can be connected to ideas from the functional renormalization group. From this viewpoint, the vacuum polarization tensor and the electron self-energy are related to two-point functions obtained from functional derivatives of the scale-dependent effective action, allowing QED in external backgrounds to be studied within a scale-dependent framework.
| Affiliation | Friedrich-Schiller-Universität Jena |
|---|---|
| Career status | PhD student |