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Title: Does the flat-space limit of AdS/CFT define the full S-matrix
Plain: Shrinking the curvature of anti-de Sitter space to zero should turn its exact boundary description into flat-space scattering. Whether this works beyond approximations is unknown.
Precise: Determine whether the flat-space limit $R_{\mathrm{AdS}} \to \infty$ at fixed string length of $N=4$ super-Yang-Mills correlators (via Mellin amplitudes, Penedones 2010) yields a well-defined nonperturbative $10\mathrm{D}$ type IIB S-matrix, including energies where black holes form.
Settled by: A proof that the limit exists and yields a unitary S-matrix, or an obstruction at high energies.
Kind: well-posed
Answer type: yes-no
References: (empty)
Literature status: open
Status note: (empty)
Posed since: (empty)