The international seminar on asymptotic safety was founded in spring 2011, with the intention of bringing the asymptotic-safety community together, and providing a platform for talks on asymptotic safety in and beyond quantum gravity, as well as related topics in quantum gravity and quantum field theory.

Upcoming seminars

Daniele Rizzo: Quantum gravity contributions to the gauge and Yukawa couplings in proper time flow


Seminar Date:

We derive quantum gravity contributions to the beta functions of the gauge and Yukawa couplings of a matter theory using the Schwinger proper-time flow equation. Working in the Einstein-Hilbert truncation, we investigate the gauge-fixing and regulator dependence of the corresponding renormalization group equations. ...

Angelo P. Chiesa: Towards two-to-two scattering of scalars in asymptotically safe quantum gravity


Seminar Date:

We compute the graviton-mediated two-to-two scattering amplitude and cross section for scalar particles in asymptotically safe quantum gravity. Specifically, we compute the full momentum dependence of the scalar-graviton three-point scattering vertex for spacelike momenta with the functional renormalisation group. W...

Carlos Pastor Marcos: Cosmology from asymptotically safe Proca theories


Seminar Date:

Effective field theories for cosmology offer a powerful framework to investigate the dynamics of space–time and address longstanding open puzzles. In this work, we initiate a programme to analyse the ultraviolet completion of vector–tensor quantum field theories within the asymptotic safety paradigm, focusing on gen...

Yannick Kluth: The perturbative Ricci flow in Gravity


Seminar Date:

We develop a perturbative formulation of the Ricci flow in gravity. Following steps analogous to the gradient flow in QCD, we supplement the usual Feynman rules for perturbative gravity by flowed propagators and vertices as well as graviton flow lines which describe the evolution of gravity along the Ricci flow. By ...

Diego Buccio: Scaling Solutions of Matter Form Factors in Asymptotically Safe Quantum Gravity


Seminar Date:

We investigate the renormalization group flow of a gravity–matter system in which a scalar field is minimally coupled to Einstein gravity and its kinetic term is given by a scale-dependent form factor fΛ(−□). Employing the Wilsonian proper-time flow equation, we derive a closed integro-differential equation that enc...

Alfio Bonnano: Quantum Gravity Constraints on Fifth Forces


Seminar Date:

We investigate how ultraviolet (UV) completion in quantum gravity constrains possible fifth forces. In scalar–tensor theories, the radial mode of a broken O(N) scalar sector mediates a Yukawa correction to Newtonian gravity, characterized by a strength \alpha_Y and a range \lambda_Y. Using functional renormalization...

Muxin Han: Ultraviolet Fixed Point in Covariant Loop Quantum Gravity


Seminar Date:

We investigate the ultraviolet behavior of 4-dimensional Lorentzian covariant Loop Quantum Gravity (LQG) and address the problem of infinite ambiguities relating to the triangulation dependence of spinfoam amplitudes. We consider the complete LQG amplitude that summing spinfoam amplitudes over 2-complexes. By introd...

The organizers

If you are interested in attending the seminars and joining the community, please contact Aaron Held or Marc Schiffer to join the corresponding mailing list.

placeholder image 1

Astrid Eichhorn

Astrid is Professor in Theoretical Physics at Heidelberg University. She works on quantum gravity and its phenomenology in particle physics, black holes and cosmology.

placeholder image 2

Aaron Held

Aaron works on phenomenological constraints in quantum and classical effective field theories of gravity. Currently, DAAD Prime Fellow at Jena University and The Princeton Gravity Initiative.

Marc Schiffer

Marc works on asymptotically safe gravity-matter systems using functional and lattice methods. Currently, Postdoctoral researcher at Radboud University.