Related Experiment Video
Updated: Dec 23, 2025

Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
Scattering of Co-Current Surface Waves on an Analogue Black Hole
Léo-Paul Euvé1, Scott Robertson2, Nicolas James3
1Laboratoire de Physique et Mécanique des Milieux Hétérogènes (UMR 7636), ESPCI, Université PSL, CNRS, Sorbonne Université, Université Paris Diderot, 10 rue Vauquelin, 75321 Paris Cedex 05, France.
Abstract:
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.
Related Concept Videos
Detection of Black Holes
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Schwarzschild Radius and Event Horizon
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
Interference and Diffraction
Reflection of Waves
Standing Waves in a Cavity
Sound Waves: Interference

