PIRSA:13110048

Matter matters in asymptotically safe quantum gravity

(2013). Matter matters in asymptotically safe quantum gravity. Perimeter Institute. https://pirsa.org/13110048

Matter matters in asymptotically safe quantum gravity. Perimeter Institute, Nov. 07, 2013, https://pirsa.org/13110048 

          @misc{ pirsa_PIRSA:13110048,
            doi = {10.48660/13110048},
            url = {https://pirsa.org/13110048},
            author = {},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Matter matters in asymptotically safe quantum gravity},
            publisher = {Perimeter Institute},
            year = {2013},
            month = {nov},
            note = {PIRSA:13110048 see, \url{https://pirsa.org}}
          }
DOI 10.48660/13110048
Collection
Talk Type Scientific Series
Subject

Abstract

The Functional Renormalisation Group technique has received great attention in recent times proving itself as a powerful tool to describe the high energy behaviour of gravitational interactions.
Its key ingredient is a nontrivial fixed point of the theory renormalization group flow which controls the behavior of the coupling constants in the ultraviolet regime and ensures that physical quantities are safe from divergences. I will briefly review the main ingredients of the gravitational asymptotic safety framework before focusing on the effect of massless minimally coupled scalars, fermions and vector fields on the gravitational fixed point. I will then set bounds on the type and number of such fields requiring the existence of a UV attractive fixed point. I will also discuss the dynamically generated quantum-gravity scale in asymptotic safety, which is the transition scale to the fixed-point regime, and its variation as a function of matter degrees of freedom. To conclude I will also consider the case of higher dimensional models.