FAU^2 Mini-Workshop on Loop Quantum Gravity

Session

Session 4

3 May 2023, 16:00

ECAP Laboratory Building

5. Complex critical point and effective dynamics of spinfoam quantum gravity

Dongxue Qu

03/05/2023, 16:00

This talk will be based on the paper arXiv:2301.02930. I will introduce the complex critical points in the 4-dimensional Lorentzian Engle-Pereira-Rovelli-Livine (EPRL) spinfoam model in the large-$j$ regime. For the 4-simplex amplitude, taking into account the complex critical point generalizes the large-$j$ asymptotics to the situation with non-Regge boundary data and relates to the twisted...

2. On consistent gauge-fixing conditions in polymerized gravitational systems

Stefan Weigl

03/05/2023, 17:00

Gauge fixing is a standard method for deriving the physical sector of a gauge theory. In the context of symmetry reduced models of loop quantum gravity a polymerisation has been applied to gauge fixed models to obtain so called effective theories that mimic the underlying quantum theory to some extend. Motivated from the question whether gauge fixing and polymerization commute, in this talk we...