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PIRSA:14040108

The Asymptotic Safety Program: New results and an inconvenient truth

APA

Reuter, M. (2014). The Asymptotic Safety Program: New results and an inconvenient truth. Perimeter Institute for Theoretical Physics. https://pirsa.org/14040108

Martin Reuter Johannes Gutenberg University Mainz

Talk numberPIRSA:14040108
Talk Type Conference

Abstract

We briefly review the various components and their conceptual status of the full Asymptotic Safety Program which aims at finding a nonperturbative infinite-cutoff limit of a regularized functional integral for a quantum field theory of gravity. It is explained why in the continuum formulation based on the Effective Average Action the key requirement of background independence unavoidably results in a "bi-metric" framework, and recent results on truncated RG flows of bi-metric actions are presented. They suggest that the next generation of truncations that must be explored should be of bi-metric type. As an application, a method of characterizing and counting physical states is shown to arise.