Scattering of co-current surface waves on an analogue black hole

Léo-Paul Euvé (1) , Scott Robertson (2) , Nicolas James (3) , Alessandro Fabbri (2, 4, 5) , Germain Rousseaux (1)

1 PPrime [Poitiers] - Institut Pprime [UPR 3346]
2 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
3 LMA [Poitiers] - Laboratoire de mathématiques et applications [UMR 7348]
4 Dep de Fisica Teorica & IFIC, Universitat de Valencia
5 Enrico Fermi Center for Study and Research | Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi

We report on what is to our knowledge the first scattering experiment of surface waves on an accelerating transcritical flow, which in the analogue gravity context is described by an effective spacetime with a black-hole horizon. This spacetime has been probed by an incident co-current wave, which partially scatters into an outgoing countercurrent wave on each side of the horizon. The measured scattering amplitudes are compatible with the predictions of the hydrodynamical theory, where the kinematical description in terms of the effective metric is exact.

Mots clés: Gravitation and Astrophysics; wave: scattering; surface; black hole: horizon; surface: deformation; effect: Hawking; correlation function; space-time

Domaines: Relativité Générale et Cosmologie Quantique [gr-qc]; Physique Générale [physics.gen-ph]

Léo-Paul Euvé, Scott Robertson, Nicolas James, Alessandro Fabbri, Germain Rousseaux. Scattering of co-current surface waves on an analogue black hole. Physical Review Letters, 2020, 124 (14), pp.141101. ⟨10.1103/PhysRevLett.124.141101⟩. ⟨hal-01828026⟩