Speaker
Johannes Thürigen
(University of Münster)
Description
Recovering the observed four-dimensional spacetime is a major challenge and distinguishing criterion for any quantum theory of gravity based on fundamentally discrete structures. Tensor models seem to generate random geometries, but only two-dimensional or fractal ones. I will show here how adding geometric degrees of freedom in the spirit of group field theory enables to overcome this obstacle. Examples of four-dimensional random geometries in such field theories open up the possibility that group-field quantum gravity entails a semiclassical regime of continuum spacetime in agreement with observations.
