Triangle Seminars
Wednesday, 10 Jun 2026
TBA
📍 London
Robin Karlsson
(University of Oxford)
Abstract:
TBA
TBA
Posted by: Kiarash Naderi
Thursday, 11 Jun 2026
The EFT of SuperPlanckian Scattering
📍 London
Ira Rothstein
(Carnegie Mellon University)
Abstract:
While quantum gravity is well understood as an effective field theory when all invariants are sub-Planckian, the super-Planckian (Regge) limit still poses open questions which we are just now starting to address. This limit leads a strong coupling problem which forces us to reorganize the calculation via resummations in order to maintain theoretical control. In this talk I will use an recently designed EFT of gravity in this Regge to reveal the structure of the series which must take a very particular form. I will then show how this EFT can be used to calculate higher order loops results using lower order results in conjunction with the rapidity renormalization group. I will also address the question of collinear singularities in this limit which Weinberg famously showed cancel for wide angle scattering.
While quantum gravity is well understood as an effective field theory when all invariants are sub-Planckian, the super-Planckian (Regge) limit still poses open questions which we are just now starting to address. This limit leads a strong coupling problem which forces us to reorganize the calculation via resummations in order to maintain theoretical control. In this talk I will use an recently designed EFT of gravity in this Regge to reveal the structure of the series which must take a very particular form. I will then show how this EFT can be used to calculate higher order loops results using lower order results in conjunction with the rapidity renormalization group. I will also address the question of collinear singularities in this limit which Weinberg famously showed cancel for wide angle scattering.
Posted by: Sebastian Cespedes