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ASYMPTOTIC SYMMETRIES AT NULL INFINITY AND LOCAL CONFORMAL PROPERTIES OF SPIN COEFFICIENTS // Tomsk State Pedagogical University Bulletin. 2012. Issue 13 (128). P. 28-31

We show that the symmetry algebra of asymptotically at four dimensional spacetimes at null innity in the sense of Newman and Unti is isomorphic to the direct sum of the abelian algebra of innitesimal conformal rescalings with bms4. We then work out the local conformal properties of the relevant Newman-Penrose coecients, as well as the surface charges and their algebra.

Keywords: Gauge-gravity correspondence, Gauge symmetries, Asymptotic symmetries, Conformal symmetry, Central extension, Surface charges, Newman-Penrose formalism, GHP formalism