PIRSA:14040089

Video URL

https://pirsa.org/14040089

Quantum Spacetime Engineering

Dittrich, B. (2014). Quantum Spacetime Engineering. Perimeter Institute for Theoretical Physics. https://pirsa.org/14040089

Dittrich, Bianca. Quantum Spacetime Engineering. Perimeter Institute for Theoretical Physics, Apr. 22, 2014, https://pirsa.org/14040089 

          @misc{ scivideos_PIRSA:14040089,
            doi = {10.48660/14040089},
            url = {https://pirsa.org/14040089},
            author = {Dittrich, Bianca},
            keywords = {},
            language = {en},
            title = {Quantum Spacetime Engineering},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2014},
            month = {apr},
            note = {PIRSA:14040089 see, \url{https://scivideos.org/index.php/pirsa/14040089}}
          }

Bianca Dittrich Perimeter Institute for Theoretical Physics

Talk numberPIRSA:14040089
DOI10.48660/14040089
Source RepositoryPIRSA
Collection
Talk Type Conference

Abstract

Given (a set of) fundamental models of quantum space time, for instance spin foam models, we aim to understand the large scale physics encoded in these fundamental models. Renormalization and coarse graining address this issue and help to understand how large scale physics depends on parameters in the fundamental models.

I will review recent work on coarse graining and renormalization of spin foam and analogue models, revealing possible large scale phases, depending on parameters of the microscopic models. I will explain how these phases are connected to topological field theories and possible vacua for the theory of quantum gravity, e.g. loop quantum gravity. I outline how these different vacua are connected to different representations of the observable algebra, that is different Hilbert spaces, and how this allows to expand the theory around different vacuum states.