Singularity resolution in loop quantum gravity: Emergence of non-Riemannian spacetimes
APA
Brahma, S. (2016). Singularity resolution in loop quantum gravity: Emergence of non-Riemannian spacetimes. Perimeter Institute. https://pirsa.org/16110049
MLA
Brahma, Suddhasattwa. Singularity resolution in loop quantum gravity: Emergence of non-Riemannian spacetimes. Perimeter Institute, Nov. 10, 2016, https://pirsa.org/16110049
BibTex
@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}} }
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.