BMS-invariant free scalar model
BMS-invariant free scalar model
The BMS (Bondi--van der Burg--Metzner--Sachs) symmetry arises as the asymptotic symmetry of flat spacetime at null infinity. In particular, the BMS algebra for three-dimensional flat spacetime (${\mathrm{BMS}}_{3}$) is generated by the super-rotation generators that form a Virasoro subalgebra with central charge ${c}_{L}$, together with mutually commuting super-translation generators. The super-rotation …