Video URL

https://pirsa.org/13070069

Casual Sets and the Quantum Action

Dowker, F. (2013). Casual Sets and the Quantum Action. Perimeter Institute for Theoretical Physics. https://pirsa.org/13070069

Dowker, Fay. Casual Sets and the Quantum Action. Perimeter Institute for Theoretical Physics, Jul. 25, 2013, https://pirsa.org/13070069 

          @misc{ scivideos_PIRSA:13070069,
            doi = {10.48660/13070069},
            url = {https://pirsa.org/13070069},
            author = {Dowker, Fay},
            keywords = {},
            language = {en},
            title = {Casual Sets and the Quantum Action},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2013},
            month = {jul},
            note = {PIRSA:13070069 see, \url{https://scivideos.org/pirsa/13070069}}
          }

Fay Dowker Imperial College London

DOI 10.48660/13070069
Source Repository PIRSA
Collection
Talk Type Conference

Abstract

The struggle between local and global concepts in physics comes to a head in  causal set quantum gravity. Local physics -- and general relativity in particular -- must be recovered in a continuum approximation if the theory is to  be successful but causal sets are inherently non-local entities. I will describe a family of causal set actions labelled by dimension, each of which is nonlocal and yet, when applied to certain causal sets, approximates the Einstein Hilbert action and is therefore effectively local.  I will explain why this is a source of hope that causal set theory has a continuum approximation.