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Bridging Carrollian and Celestial Holography

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arxiv 2212.12553 v2 pith:76OH5FMY submitted 2022-12-23 hep-th gr-qc

Bridging Carrollian and Celestial Holography

classification hep-th gr-qc
keywords carrolliancelestialconformalboundaryfieldholographicholographyidentities
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Gravity in $4d$ asymptotically flat spacetime constitutes the archetypal example of a gravitational system with leaky boundary conditions. Pursuing our analysis of [1], we argue that the holographic description of such a system requires the coupling of the dual theory living at null infinity to some external sources encoding the radiation reaching the conformal boundary and responsible for the non-conservation of the charges. In particular, we show that the sourced Ward identities of a conformal Carrollian field theory living at null infinity reproduce the BMS flux-balance laws. We also derive the general form of low-point correlation functions for conformal Carrollian field theories and exhibit a new branch of solutions, which is argued to be the relevant one for holographic purposes. We then relate our Carrollian approach to the celestial holography proposal by mapping the Carrollian Ward identities to those constraining celestial operators through a suitable integral transform.

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Cited by 34 Pith papers

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