Bulk Reconstruction of Scalar Excitations in Flat${}_3$/CCFT${}_2$ and the Flat Limit from (A)dS${}_3$/CFT${}_2$

We explore the reconstruction of bulk local states in three-dimensional flat spacetime (Flat${}_3$) using states from two-dimensional Carrollian conformal field theories (CCFT${}_2$), proposed as dual field theories in one lower dimension. For massive scalar-type bulk excitations, reconstruction is achieved through states in the induced representation. This method successfully reproduces the bulk massive scalar spectrum and the bulk-to-bulk propagator. Additionally, we identify a new flat limit from AdS${}_3$ and dS${}_3$ spacetimes, further validating our proposal for scalar reconstruction in Flat${}_3$/CCFT${}_2$.