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Résumé |
Scattering-amplitude methods have been successful in computing state-of-the-art
observables for binary black-hole systems. In particular, Kerr black holes can be
described via effective field theories for massive higher-spin particles. The
cubic interactions for such theories were found in full generality and used to
compute leading-order observables, to any order in the black hole’s spin. However,
constructing higher-order interactions remains an open challenge. In this talk, I
will propose two complementary approaches to tackle the problem. The first is a
bottom-up approach, where we construct higher-spin EFTs, identify a set of
physical constraints that underlie the Kerr amplitudes, and use them to obtain
explicit four-point results. The second is a top-down approach, where we study
higher-spin amplitudes in string theory and discuss their relation to Kerr. |
