Seminars
# Spinning waveforms from classical amplitudes

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AULA GRASSANO (https://infn-it.zoom.us/j/82247215673?pwd=em1GRklEYngwMGVBbVVBb2VoL1pvdz09)
### AULA GRASSANO

#### https://infn-it.zoom.us/j/82247215673?pwd=em1GRklEYngwMGVBbVVBb2VoL1pvdz09

Description

We discuss how to compute scattering waveforms for the

classical two-body problem purely from on-shell five-point amplitudes,

generalizing the KMOC (in-in) approach to radiative observables.

Restricting to the case of two Kerr black-holes, we derive the

time-domain waveform at leading order in the Post-Minkowskian expansion

and at quartic order in the spin by using analyticity arguments to

bypass the conventional observable phase-space integration. The result

is expressed only in terms of the three-point amplitude and the

four-point Compton amplitude, which makes it easier to generalize for

the case of generic spinning bodies (i.e. with tidal effects). Finally,

I will show how we can analytically continue the waveform from

hyperbolic to (eccentric) bound orbits.