Scattering of gravity waves in subcritical flows over an obstacle, theoretical and experimental progresses
by
Prof.Renaud Parentani(Laboratoire de Physique Théorique, Université de Paris-Sud Orsay)
→
Europe/Rome
Aula Teorici (Dipartimento di fisica e Astronomia)
Aula Teorici
Dipartimento di fisica e Astronomia
Via Irnerio, 46
Description
In 1981 Unruh suggested that one might test the Hawking effect by studying the scattering of linear perturbations in trans-critical flows. Since then, several experiments have been carried out in different settings. We here report on progresses in the study of surface waves in water tanks. The first progress concerns the modification of the scattering coefficients when dealing with subcritical flows as opposed to transcritical ones. The second concerns the a new method of extracting the scattering coefficients by using correlations (constructive interferences) between various waves.
