Speaker
Description
Asymptotically safe quantum gravity provides a UV completion of metric quantum gravity, with and without matter. This is achieved via scale invariance in the strongly coupled regime, entailing finiteness at all scales. Compared to the existence of the scaling symmetry, the study of the unitarity of the theory is still in its infancy. In this talk, I present the asymptotically safe scattering amplitude of two-to-two scalar fields.
Focusing on the mediated amplitude, we use modern functional renormalisation group methods to obtain non-perturbative momentum-dependent results for the resummed scalar-graviton vertex and propagators.
Together with reconstruction and analytic continuation techniques. These are corredated by the gravitational contribution to the contact amplitude, whose we resum directly in Lorentzian signature.
This allows us to study the non-perturbative amplitude and cross-section.
The cross-section is an observable of the theory; it is compatible with GR at small energies, and it respects unitarity in the UV.
| Affiliation | University of Sussex |
|---|---|
| Link to paper | https://arxiv.org/abs/2603.10168 |
| Career status | PhD student |