What do particle scattering amplitudes reveal about 5D black holes?

Scattering amplitudes — the quantities particle physicists calculate for collisions — turn out to encode the gravitational fields of spinning black holes when you take their classical limit. This works beautifully in four dimensions for Kerr black holes; now the same machinery is extended to five dimensions, where black holes can spin in two independent planes. The authors identify which specific amplitudes correspond to the Myers-Perry black hole and discover that modeling more general spacetimes requires a new ingredient: the Hodge dual of the spin tensor.