# Memory effect In four spacetime dimensions, the order at which memory effect appears in an asymptotic expansion agrees with the order at which radiation is described, so they become interwined. This is not true in other dimensions. ## Refs - [[2014#Strominger, Zhiboedov]] ## Applications - distinguishing between black hole and other spherically symmetric objects: [[2023#Bhattacharya, Ghosh]] ## Related - [[0064 BMS group]] - [[0010 Celestial holography]]