Speaker
Renata Ferrero
Description
In quantum field theory, coarse graining (or renormalization) is a well-established procedure: physics is formulated on a fixed spacetime background, correlators are computed between fields at different points, and the renormalization group organizes physics in terms of length scales defined by external rulers. In quantum gravity, this framework has to be reconsidered: there is no fixed background geometry and no external notion of scale. After introducing the renormalization group in quantum gravity, with an emphasis on asymptotic safety, I will discuss how a relational perspective changes the notion of coarse graining, allowing it to acquire a more physical meaning in a quantum gravity context.
Author
Renata Ferrero