BMS-like symmetries in cosmology

PIRSA ID: 22090081
Series: Quantum Gravity
Event Type: Seminar
Scientific Area(s):
Quantum Gravity
End date:
  • 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.

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