Cornering Quantum Gravity

Understand

After introducing the covariant phase space calculus, Noether's theorems are discussed, with particular emphasis on Noether's second theorem and the role of gauge symmetries.

• This is followed by the enunciation of the theory of asymptotic symmetries, and later its application to gravity.
• Specifically, we review how the BMS group arises as the asymptotic symmetry group of gravity at null infinity.
• Symmetries are so powerful and constraining that memory effects and soft theorems can be derived from them.