Wochenübersicht

Jet cross sections at high-energy colliders exhibit intricate patterns of logarithmically enhanced higher-order corrections. In particular, so-called non-global logarithms emerge from soft radiation emitted off energetic partons inside jets. While this is a single-logarithmic effect at lepton colliders, at hadron colliders phase factors in the amplitudes lead to double-logarithmic corrections starting at four-loop order. This effect was discovered a long time ago, but not much is known about the higher-order behavior of these terms and their process dependence. We derive, for the first time, the all-order structure of these "super-leading logarithms" for generic \(2\to l\) scattering processes at hadron colliders and resum them in closed form.

To be announced

The asymptotic safety program strives for a high-energy completion of gravity and gravity-matter systems by an interacting renormalization group fixed point, the Reuter fixed point. The fixed point renders the theory safe from unphysical divergences at high energies and equips the construction with predictive power. In this talk I will give a pedagogical introduction to the program. In particular, I will argue that the inclusion of form factors - generalizing the running couplings encountered in quantum field theory to curved spacetime - is essential for investigating questions related to the causality and unitarity of Asymptotic Safety. Moreover, I will outline how form factors provide a concrete perspective for formulating various quantum gravity programs in a unifying language.