BMS-like symmetries in cosmology
PIRSA ID:
22090081
Série :
Quantum Gravity
Event Type:
Seminar
Domaine(s) scientifique(s) :
Quantum Gravity
Date de fin :
Speaker(s):
- Beatrice Bonga, Radboud Universiteit Nijmegen
There exists a solid framework to study gravitational waves in full, non-linear general relativity when the spacetime is asymptotically flat. An essential aspect of this framework is asymptotic symmetries. These symmetries are the BMS symmetries. The situation for cosmological spacetimes is different, however. Expanding spacetimes, whose expansion is decelerating such as matter- or radiation-dominated universes, share some similarities with the asymptotically flat case nonetheless. Not surprisingly, their asymptotic symmetries also share similarities with the BMS symmetries, but are not the same.
Zoom Link: https://pitp.zoom.us/j/98168915236?pwd=ejFtaVpVZXAxT2NIdDhtMUNSbmRvQT09