A 2d chiral action on the momentum-space celestial sphere is shown to reproduce BMS and w1+∞ symmetries, stress tensors, and soft dressing of 4d self-dual gravity.
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2d theory for asymptotic dynamics of 4d (self-dual) Einstein gravity
A 2d chiral action on the momentum-space celestial sphere is shown to reproduce BMS and w1+∞ symmetries, stress tensors, and soft dressing of 4d self-dual gravity.