PIRSA:16110049

Singularity resolution in loop quantum gravity: Emergence of non-Riemannian spacetimes

Brahma, S. (2016). Singularity resolution in loop quantum gravity: Emergence of non-Riemannian spacetimes. Perimeter Institute. https://pirsa.org/16110049

Brahma, Suddhasattwa. Singularity resolution in loop quantum gravity: Emergence of non-Riemannian spacetimes. Perimeter Institute, Nov. 10, 2016, https://pirsa.org/16110049 

          @misc{ pirsa_PIRSA:16110049,
            doi = {10.48660/16110049},
            url = {https://pirsa.org/16110049},
            author = {Brahma, Suddhasattwa},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Singularity resolution in loop quantum gravity: Emergence of non-Riemannian spacetimes},
            publisher = {Perimeter Institute},
            year = {2016},
            month = {nov},
            note = {PIRSA:16110049 see, \url{https://pirsa.org}}
          }

Suddhasattwa Brahma

McGill University

Talk number
PIRSA:16110049
Collection
Talk Type
Subject
Abstract

It is a common expectation in quantum gravity that the fundamental nature of space-time would be radically different from the smooth continuum of classical general relativity. In this talk it shall be shown that a quantum modification from loop quantum gravity crucial for singularity resolution is also responsible for deforming the underlying space-time in a manner which cannot be realized using classical geometric structures. With the minimum requirement that the quantum theory satisfies a well-defined notion of covariance explicit midisuperspace models manifesting such non-Riemannian space-times shall be shown to exhibit the physical phenomenon of non-singular signature change. Robustness and implications of this effect shall also be briefly discussed.