Speaker
Description
Quantum gravity remains a fundamental challenge in theoretical physics, with multiple approaches striving for a consistent quantum description of spacetime. Among these, Asymptotically Safe Gravity offers a promising framework based on quantum field theory and on an interacting ultraviolet completion that renders the theory non-perturbatively renormalizable. After reviewing its basics, I will discuss two key questions: how to test its consistency and low-energy implications, and how to compare it with other quantum gravity theories. Both can be tackled by looking at quantum gravity through the lens of effective field theory: mapping different ultraviolet completions onto "landscapes" of effective theories allows for systematic tests against theoretical constraints like positivity bounds, comparisons with other quantum gravity theories—such as the string landscape identified by swampland conjectures—and more direct connections to key questions in black hole physics and cosmology. I will present recent results illustrating these points and their broader implications.
