Speaker
Description
The existence of an ultraviolet (UV) fixed point in the renormalization group (RG) flow of gravity provides a non-perturbative route to renormalizing gravity, that is Asymptotically Safe Quantum Gravity. Evidence for such a UV completion has been found in a variety of settings, including higher-derivative gravity theories and gravity–matter systems. However, despite its apparent robustness, it remains an open question whether this UV completion corresponds to the true, metric-based quantum theory of gravity.
On the other hand, chiral perturbation theories share several common features with gravity, such as perturbative non-renormalizability and the nonlinear nature of their interactions. As effective low-energy descriptions of strong interactions, their UV completion is known to involve different degrees of freedom, namely quarks and gluons.
In this talk, I explore the possibility that chiral theories exhibit a UV fixed point along the RG flow. I will show that, despite their similarities with gravitational theories, these models do not admit an asymptotically safe UV completion within a quartic-derivative truncation. This result is consistent with the existence of an alternative UV completion and highlights that asymptotic safety is not a generic property, but rather a feature of a limited class of special systems.
| Affiliation | Niels Bohr Institute |
|---|---|
| Career status | Postdoc |